diff --git a/mock/local_test.py b/mock/local_test.py
index 7061395..0aaef4e 100644
--- a/mock/local_test.py
+++ b/mock/local_test.py
@@ -1,19 +1,10 @@
-from argenta import App, DataBridge, Response, Router
-from argenta.di import FromDishka
-from argenta.di.integration import setup_dishka, _auto_inject_handlers
-from argenta.di.providers import SystemProvider
-from dishka import make_container
+from argenta import Command, Response, Router
+from argenta.command import InputCommand
 
-container = make_container()
-
-Response.patch_by_container(container)
-
-app = App()
 router = Router()
 
-@router.command('command')
-def handler(res: Response, data_bridge: FromDishka[DataBridge]):
-    print(data_bridge)
-    
-_auto_inject_handlers(app)
-_auto_inject_handlers(app)
+@router.command(Command('heLLo'))
+def handler(_res: Response) -> None:
+    print("Hello World!")
+
+router.finds_appropriate_handler(InputCommand('HellO'))
diff --git a/src/argenta/app/models.py b/src/argenta/app/models.py
index 1da6c74..9b0d31b 100644
--- a/src/argenta/app/models.py
+++ b/src/argenta/app/models.py
@@ -26,7 +26,6 @@ from argenta.command.exceptions import (
 from argenta.command.models import Command, InputCommand
 from argenta.response import Response
 from argenta.router import Router
-from argenta.router.defaults import system_router
 
 Matches: TypeAlias = list[str] | list[Never]
 
@@ -50,12 +49,12 @@ class BaseApp:
         self._prompt: str = prompt
         self._print_func: Printer = print_func
         self._exit_command: Command = exit_command
-        self._system_router_title: str = system_router_title
         self._dividing_line: StaticDividingLine | DynamicDividingLine = dividing_line
         self._ignore_command_register: bool = ignore_command_register
         self._repeat_command_groups_printing_description: bool = repeat_command_groups_printing
         self._override_system_messages: bool = override_system_messages
         self._autocompleter: AutoCompleter = autocompleter
+        self.system_router: Router = Router(title=system_router_title)
 
         self._farewell_message: str = farewell_message
         self._initial_message: str = initial_message
@@ -75,18 +74,20 @@ class BaseApp:
             else self._matching_default_triggers_with_routers
         )
 
-        self._incorrect_input_syntax_handler: NonStandardBehaviorHandler[str] = lambda _: print_func(
-            f"Incorrect flag syntax: {_}"
+        self._incorrect_input_syntax_handler: NonStandardBehaviorHandler[str] = (
+            lambda _: print_func(f"Incorrect flag syntax: {_}")
         )
-        self._repeated_input_flags_handler: NonStandardBehaviorHandler[str] = lambda _: print_func(
-            f"Repeated input flags: {_}"
+        self._repeated_input_flags_handler: NonStandardBehaviorHandler[str] = (
+            lambda _: print_func(f"Repeated input flags: {_}")
         )
-        self._empty_input_command_handler: EmptyCommandHandler = lambda: print_func("Empty input command")
-        self._unknown_command_handler: NonStandardBehaviorHandler[InputCommand] = lambda _: print_func(
-            f"Unknown command: {_.trigger}"
+        self._empty_input_command_handler: EmptyCommandHandler = lambda: print_func(
+            "Empty input command"
         )
-        self._exit_command_handler: NonStandardBehaviorHandler[Response] = lambda _: print_func(
-            self._farewell_message
+        self._unknown_command_handler: NonStandardBehaviorHandler[InputCommand] = (
+            lambda _: print_func(f"Unknown command: {_.trigger}")
+        )
+        self._exit_command_handler: NonStandardBehaviorHandler[Response] = (
+            lambda _: print_func(self._farewell_message)
         )
 
     def set_description_message_pattern(self, _: DescriptionMessageGenerator, /) -> None:
@@ -97,7 +98,9 @@ class BaseApp:
         """
         self._description_message_gen = _
 
-    def set_incorrect_input_syntax_handler(self, _: NonStandardBehaviorHandler[str], /) -> None:
+    def set_incorrect_input_syntax_handler(
+        self, _: NonStandardBehaviorHandler[str], /
+    ) -> None:
         """
         Public. Sets the handler for incorrect flags when entering a command
         :param _: handler for incorrect flags when entering a command
@@ -105,7 +108,9 @@ class BaseApp:
         """
         self._incorrect_input_syntax_handler = _
 
-    def set_repeated_input_flags_handler(self, _: NonStandardBehaviorHandler[str], /) -> None:
+    def set_repeated_input_flags_handler(
+        self, _: NonStandardBehaviorHandler[str], /
+    ) -> None:
         """
         Public. Sets the handler for repeated flags when entering a command
         :param _: handler for repeated flags when entering a command
@@ -113,7 +118,9 @@ class BaseApp:
         """
         self._repeated_input_flags_handler = _
 
-    def set_unknown_command_handler(self, _: NonStandardBehaviorHandler[InputCommand], /) -> None:
+    def set_unknown_command_handler(
+        self, _: NonStandardBehaviorHandler[InputCommand], /
+    ) -> None:
         """
         Public. Sets the handler for unknown commands when entering a command
         :param _: handler for unknown commands when entering a command
@@ -129,7 +136,9 @@ class BaseApp:
         """
         self._empty_input_command_handler = _
 
-    def set_exit_command_handler(self, _: NonStandardBehaviorHandler[Response], /) -> None:
+    def set_exit_command_handler(
+        self, _: NonStandardBehaviorHandler[Response], /
+    ) -> None:
         """
         Public. Sets the handler for exit command when entering a command
         :param _: handler for exit command when entering a command
@@ -164,7 +173,11 @@ class BaseApp:
             clear_text = re.sub(r"\u001b\[[0-9;]*m", "", text)
             max_length_line = max([len(line) for line in clear_text.split("\n")])
             max_length_line = (
-                max_length_line if 10 <= max_length_line <= 80 else 80 if max_length_line > 80 else 10
+                max_length_line
+                if 10 <= max_length_line <= 80
+                else 80
+                if max_length_line > 80
+                else 10
             )
 
             self._print_func(
@@ -181,11 +194,15 @@ class BaseApp:
 
         elif isinstance(self._dividing_line, StaticDividingLine):  # pyright: ignore[reportUnnecessaryIsInstance]
             self._print_func(
-                self._dividing_line.get_full_static_line(is_override=self._override_system_messages)
+                self._dividing_line.get_full_static_line(
+                    is_override=self._override_system_messages
+                )
             )
             print(text.strip("\n"))
             self._print_func(
-                self._dividing_line.get_full_static_line(is_override=self._override_system_messages)
+                self._dividing_line.get_full_static_line(
+                    is_override=self._override_system_messages
+                )
             )
 
         else:
@@ -219,10 +236,14 @@ class BaseApp:
         """
         input_command_trigger = command.trigger
         if self._ignore_command_register:
-            if input_command_trigger.lower() in list(self._current_matching_triggers_with_routers.keys()):
+            if input_command_trigger.lower() in list(
+                self._current_matching_triggers_with_routers.keys()
+            ):
                 return False
         else:
-            if input_command_trigger in list(self._current_matching_triggers_with_routers.keys()):
+            if input_command_trigger in list(
+                self._current_matching_triggers_with_routers.keys()
+            ):
                 return False
         return True
 
@@ -245,14 +266,13 @@ class BaseApp:
         Private. Sets up system router
         :return: None
         """
-        system_router.title = self._system_router_title
 
-        @system_router.command(self._exit_command)
+        @self.system_router.command(self._exit_command)
         def _(response: Response) -> None:
             self._exit_command_handler(response)
 
-        system_router.command_register_ignore = self._ignore_command_register
-        self.registered_routers.add_registered_router(system_router)
+        self.system_router.command_register_ignore = self._ignore_command_register
+        self.registered_routers.add_registered_router(self.system_router)
 
     def _most_similar_command(self, unknown_command: str) -> str | None:
         all_commands = list(self._current_matching_triggers_with_routers.keys())
@@ -279,7 +299,9 @@ class BaseApp:
         :return: None
         """
         self._prompt = f"[italic dim bold]{self._prompt}"
-        self._initial_message = "\n" + f"[bold red]{text2art(self._initial_message, font='tarty1')}" + "\n"
+        self._initial_message = (
+            "\n" + f"[bold red]{text2art(self._initial_message, font='tarty1')}" + "\n"
+        )
         self._farewell_message = (
             "[bold red]\n\n"
             + str(text2art(self._farewell_message, font="chanky"))  # pyright: ignore[reportUnknownArgumentType]
@@ -297,14 +319,20 @@ class BaseApp:
         self._repeated_input_flags_handler = lambda raw_command: self._print_func(
             f"[red bold]Repeated input flags: {escape(raw_command)}"
         )
-        self._empty_input_command_handler = lambda: self._print_func("[red bold]Empty input command")
+        self._empty_input_command_handler = lambda: self._print_func(
+            "[red bold]Empty input command"
+        )
 
         def unknown_command_handler(command: InputCommand) -> None:
             cmd_trg: str = command.trigger
             mst_sim_cmd: str | None = self._most_similar_command(cmd_trg)
-            first_part_of_text = f"[red]Unknown command:[/red] [blue]{escape(cmd_trg)}[/blue]"
+            first_part_of_text = (
+                f"[red]Unknown command:[/red] [blue]{escape(cmd_trg)}[/blue]"
+            )
             second_part_of_text = (
-                ("[red], most similar:[/red] " + ("[blue]" + mst_sim_cmd + "[/blue]")) if mst_sim_cmd else ""
+                ("[red], most similar:[/red] " + ("[blue]" + mst_sim_cmd + "[/blue]"))
+                if mst_sim_cmd
+                else ""
             )
             self._print_func(first_part_of_text + second_part_of_text)
 
@@ -324,9 +352,13 @@ class BaseApp:
 
             for trigger in combined:
                 self._matching_default_triggers_with_routers[trigger] = router_entity
-                self._matching_lower_triggers_with_routers[trigger.lower()] = router_entity
+                self._matching_lower_triggers_with_routers[trigger.lower()] = (
+                    router_entity
+                )
 
-        self._autocompleter.initial_setup(list(self._current_matching_triggers_with_routers.keys()))
+        self._autocompleter.initial_setup(
+            list(self._current_matching_triggers_with_routers.keys())
+        )
 
         if not self._override_system_messages:
             self._setup_default_view()
@@ -339,9 +371,11 @@ class BaseApp:
             print("\n")
         if not self._repeat_command_groups_printing_description:
             self._print_command_group_description()
-            
+
     def _process_exist_and_valid_command(self, input_command: InputCommand) -> None:
-        processing_router = self._current_matching_triggers_with_routers[input_command.trigger.lower()]
+        processing_router = self._current_matching_triggers_with_routers[
+            input_command.trigger.lower()
+        ]
 
         if processing_router.disable_redirect_stdout:
             dividing_line_unit_part: str = self._dividing_line.get_unit_part()
@@ -439,9 +473,10 @@ class App(BaseApp):
                 continue
 
             if self._is_exit_command(input_command):
-                system_router.finds_appropriate_handler(input_command)
+                self.system_router.finds_appropriate_handler(input_command)
                 self._autocompleter.exit_setup(
-                    list(self._current_matching_triggers_with_routers.keys()), self._ignore_command_register
+                    list(self._current_matching_triggers_with_routers.keys()),
+                    self._ignore_command_register,
                 )
                 return
 
diff --git a/src/argenta/response/status.py b/src/argenta/response/status.py
index c736de0..c156494 100644
--- a/src/argenta/response/status.py
+++ b/src/argenta/response/status.py
@@ -1,6 +1,7 @@
 __all__ = ["ResponseStatus"]
 
 from enum import Enum
+from typing import Self
 
 
 class ResponseStatus(Enum):
@@ -10,7 +11,7 @@ class ResponseStatus(Enum):
     UNDEFINED_AND_INVALID_FLAGS = "UNDEFINED_AND_INVALID_FLAGS"
 
     @classmethod
-    def from_flags(cls, *, has_invalid_value_flags: bool, has_undefined_flags: bool) -> "ResponseStatus":
+    def from_flags(cls, *, has_invalid_value_flags: bool, has_undefined_flags: bool) -> Self:
         key = (has_invalid_value_flags, has_undefined_flags)
         status_map: dict[tuple[bool, bool], ResponseStatus] = {
             (True, True): cls.UNDEFINED_AND_INVALID_FLAGS,
diff --git a/src/argenta/router/command_handler/entity.py b/src/argenta/router/command_handler/entity.py
index b95afd6..51dc1cb 100644
--- a/src/argenta/router/command_handler/entity.py
+++ b/src/argenta/router/command_handler/entity.py
@@ -7,14 +7,17 @@ from argenta.command import Command
 from argenta.response import Response
 
 
+HandlerFunc = Callable[..., None]
+
+
 class CommandHandler:
-    def __init__(self, handler_as_func: Callable[..., None], handled_command: Command):
+    def __init__(self, handler_as_func: HandlerFunc, handled_command: Command):
         """
         Private. Entity of the model linking the handler and the command being processed
         :param handler: the handler being called
         :param handled_command: the command being processed
         """
-        self.handler_as_func: Callable[..., None] = handler_as_func
+        self.handler_as_func: HandlerFunc = handler_as_func
         self.handled_command: Command = handled_command
 
     def handling(self, response: Response) -> None:
@@ -27,12 +30,13 @@ class CommandHandler:
 
 
 class CommandHandlers:
-    def __init__(self, command_handlers: list[CommandHandler] | None = None):
+    def __init__(self, command_handlers: tuple[CommandHandler] = tuple()):
         """
         Private. The model that unites all CommandHandler of the routers
         :param command_handlers: list of CommandHandlers for register
         """
-        self.command_handlers: list[CommandHandler] = command_handlers if command_handlers else []
+        self.command_handlers: list[CommandHandler] = list(command_handlers) if command_handlers else []
+        self.paired_command_handler_trigger: dict[str, CommandHandler] = {x.handled_command.trigger: x for x in command_handlers}
 
     def add_handler(self, command_handler: CommandHandler) -> None:
         """
@@ -41,6 +45,13 @@ class CommandHandlers:
         :return: None
         """
         self.command_handlers.append(command_handler)
+        self.paired_command_handler_trigger[command_handler.handled_command.trigger.lower()] = command_handler
+        for alias in command_handler.handled_command.aliases:
+            self.paired_command_handler_trigger[alias.lower()] = command_handler
+            
+    def get_command_handler_by_trigger(self, trigger: str):
+        print(self.paired_command_handler_trigger)
+        return self.paired_command_handler_trigger.get(trigger)
 
     def __iter__(self) -> Iterator[CommandHandler]:
         return iter(self.command_handlers)
diff --git a/src/argenta/router/defaults.py b/src/argenta/router/defaults.py
deleted file mode 100644
index b0b96aa..0000000
--- a/src/argenta/router/defaults.py
+++ /dev/null
@@ -1,5 +0,0 @@
-__all__ = ["system_router"]
-
-from argenta.router import Router
-
-system_router = Router(title="System points:")
diff --git a/src/argenta/router/entity.py b/src/argenta/router/entity.py
index b267a4f..12edb33 100644
--- a/src/argenta/router/entity.py
+++ b/src/argenta/router/entity.py
@@ -11,7 +11,9 @@ from argenta.command.flag.flags import Flags, InputFlags
 from argenta.response import Response, ResponseStatus
 from argenta.router.command_handler.entity import CommandHandler, CommandHandlers
 from argenta.router.exceptions import (
+    RepeatedAliasNameException,
     RepeatedFlagNameException,
+    RepeatedTriggerNameException,
     RequiredArgumentNotPassedException,
     TriggerContainSpacesException,
 )
@@ -57,13 +59,8 @@ class Router:
             redefined_command = command
 
         self._validate_command(redefined_command)
-    
-        if overlapping := (self.aliases | self.triggers) & redefined_command.aliases:
-            Console().print(f"\n[b red]WARNING:[/b red] Overlapping trigger or alias: [b blue]{overlapping}[/b blue]")
+        self._update_routing_keys(redefined_command)
         
-        self.aliases.update(redefined_command.aliases)
-        self.triggers.add(redefined_command.trigger)
-
         def decorator(func: HandlerFunc) -> HandlerFunc:
             _validate_func_args(func)
             self.command_handlers.add_handler(CommandHandler(func, redefined_command))
@@ -80,10 +77,22 @@ class Router:
         command_name: str = command.trigger
         if command_name.find(" ") != -1:
             raise TriggerContainSpacesException()
+            
+        if command_name.lower() in self.triggers:
+            raise RepeatedTriggerNameException()
+            
+        if overlapping := (self.aliases | self.triggers) & set(map(lambda x: x.lower(), command.aliases)):
+            raise RepeatedAliasNameException(overlapping)
+            
         flags: Flags = command.registered_flags
         flags_name: list[str] = [flag.string_entity.lower() for flag in flags]
         if len(set(flags_name)) < len(flags_name):
             raise RepeatedFlagNameException()
+        
+    def _update_routing_keys(self, registered_command: Command):
+        redefined_command_aliases_in_lower = set(map(lambda x: x.lower(), registered_command.aliases))
+        self.aliases.update(redefined_command_aliases_in_lower)
+        self.triggers.add(registered_command.trigger.lower())
 
     def finds_appropriate_handler(self, input_command: InputCommand) -> None:
         """
@@ -91,15 +100,15 @@ class Router:
         :param input_command: input command as InputCommand
         :return: None
         """
-        input_command_name: str = input_command.trigger
+        input_command_name: str = input_command.trigger.lower()
         input_command_flags: InputFlags = input_command.input_flags
 
-        for command_handler in self.command_handlers:
-            handle_command = command_handler.handled_command
-            if input_command_name.lower() == handle_command.trigger.lower():
-                self.process_input_command(input_command_flags, command_handler)
-            if input_command_name.lower() in handle_command.aliases:
-                self.process_input_command(input_command_flags, command_handler)
+        command_handler = self.command_handlers.get_command_handler_by_trigger(input_command_name)
+        
+        if not command_handler:
+            raise RuntimeError(f"Handler for '{input_command.trigger}' command not found!")
+        else:
+            self.process_input_command(input_command_flags, command_handler)
 
     def process_input_command(self, input_command_flags: InputFlags, command_handler: CommandHandler) -> None:
         """
@@ -147,13 +156,14 @@ def _structuring_input_flags(handled_command: Command, input_flags: InputFlags)
             undefined_flags = True
 
     status = ResponseStatus.from_flags(
-        has_invalid_value_flags=invalid_value_flags, has_undefined_flags=undefined_flags
+        has_invalid_value_flags=invalid_value_flags, 
+        has_undefined_flags=undefined_flags
     )
 
     return Response(status=status, input_flags=input_flags)
 
 
-def _validate_func_args(func: Callable[..., None]) -> None:
+def _validate_func_args(func: HandlerFunc) -> None:
     """
     Private. Validates the arguments of the handler
     :param func: entity of the handler func
diff --git a/src/argenta/router/exceptions.py b/src/argenta/router/exceptions.py
index 6754a37..772c02b 100644
--- a/src/argenta/router/exceptions.py
+++ b/src/argenta/router/exceptions.py
@@ -11,7 +11,31 @@ class RepeatedFlagNameException(Exception):
     @override
     def __str__(self) -> str:
         return "Repeated registered flag names in register command"
+        
 
+class RepeatedTriggerNameException(Exception):
+    """
+    Private. Raised when a repeated trigger name is registered
+    """
+
+    @override
+    def __str__(self) -> str:
+        return "Repeated trigger name in registered commands"
+        
+
+class RepeatedAliasNameException(Exception):
+    """
+    Private. Raised when a repeated alias name is registered
+    """
+    @override
+    def __init__(self, repeated_aliases: set[str]) -> None:
+        self.repeated_aliases = repeated_aliases
+        super().__init__()
+
+    @override
+    def __str__(self) -> str:
+        return f"Repeated aliases names: {self.repeated_aliases}"
+        
 
 class RequiredArgumentNotPassedException(Exception):
     """
diff --git a/tests/unit_tests/test_app.py b/tests/unit_tests/test_app.py
index 2b99db4..e75d89f 100644
--- a/tests/unit_tests/test_app.py
+++ b/tests/unit_tests/test_app.py
@@ -1,3 +1,4 @@
+from argenta.router.exceptions import RepeatedAliasNameException
 import pytest
 from pytest import CaptureFixture
 
@@ -207,24 +208,17 @@ def test_include_routers_registers_multiple_routers() -> None:
     assert app.registered_routers.registered_routers == [router, router2]
 
 
-def test_overlapping_aliases_prints_warning(capsys: CaptureFixture[str]) -> None:
-    app = App(override_system_messages=True)
+def test_overlapping_aliases_raises_exception() -> None:
     router = Router()
 
     @router.command(Command('test', aliases={'alias'}))
     def handler(_res: Response) -> None:
         pass
 
-    @router.command(Command('test2', aliases={'alias'}))
-    def handler2(_res: Response) -> None:
-        pass
-
-    app.include_routers(router)
-    app._pre_cycle_setup()
-
-    captured = capsys.readouterr()
-
-    assert "Overlapping" in captured.out
+    with pytest.raises(RepeatedAliasNameException):
+        @router.command(Command('test2', aliases={'alias'}))
+        def handler2(_res: Response) -> None:
+            pass
 
 
 # ============================================================================
diff --git a/tests/unit_tests/test_router.py b/tests/unit_tests/test_router.py
index 1ec082f..d6c022a 100644
--- a/tests/unit_tests/test_router.py
+++ b/tests/unit_tests/test_router.py
@@ -12,6 +12,7 @@ from argenta.router import Router
 from argenta.router.entity import _structuring_input_flags, _validate_func_args  # pyright: ignore[reportPrivateUsage]
 from argenta.router.exceptions import (
     RepeatedFlagNameException,
+    RepeatedTriggerNameException,
     RequiredArgumentNotPassedException,
     TriggerContainSpacesException,
 )
@@ -26,7 +27,20 @@ def test_validate_command_raises_error_for_trigger_with_spaces() -> None:
     router = Router()
     with pytest.raises(TriggerContainSpacesException):
         router._validate_command(Command(trigger='command with spaces'))
-
+        
+        
+def test_validate_command_raises_error_for_same_trigger() -> None:
+    router = Router()
+    
+    @router.command('comm')
+    def handler(res: Response):
+        pass
+    
+    with pytest.raises(RepeatedTriggerNameException):
+        @router.command('comm')
+        def handler2(res: Response):
+            pass
+        
 
 def test_validate_command_raises_error_for_repeated_flag_names() -> None:
     router = Router()
@@ -192,6 +206,33 @@ def test_finds_appropriate_handler_executes_handler_by_alias(capsys: CaptureFixt
     output = capsys.readouterr()
 
     assert "Hello World!" in output.out
+    
+def test_finds_appropriate_handler_executes_handler_by_alias_with_differrent_register(capsys: CaptureFixture[str]) -> None:
+    router = Router()
+
+    @router.command(Command('hello', aliases={'hI'}))
+    def handler(_res: Response) -> None:
+        print("Hello World!")
+
+    router.finds_appropriate_handler(InputCommand('HI'))
+
+    output = capsys.readouterr()
+
+    assert "Hello World!" in output.out
+    
+    
+def test_finds_appropriate_handler_executes_handler_by_trigger_with_differrent_register(capsys: CaptureFixture[str]) -> None:
+    router = Router()
+
+    @router.command(Command('heLLo'))
+    def handler(_res: Response) -> None:
+        print("Hello World!")
+
+    router.finds_appropriate_handler(InputCommand('HellO'))
+
+    output = capsys.readouterr()
+
+    assert "Hello World!" in output.out
 
 
 def test_finds_appropriate_handler_executes_handler_with_flags_by_alias(capsys: CaptureFixture[str]) -> None: