step

android/app/build.gradle.kts

@@ -34,18 +34,22 @@ android {
         versionName = flutter.versionName
     }
 
-    signingConfigs {
-        create("release") {
-            keyAlias = keyProperties["keyAlias"] as String
-            keyPassword = keyProperties["keyPassword"] as String
-            storeFile = file(keyProperties["storeFile"] as String)
-            storePassword = keyProperties["storePassword"] as String
+    if (keyPropertiesFile.exists()) {
+        signingConfigs {
+            create("release") {
+                keyAlias = keyProperties["keyAlias"] as String
+                keyPassword = keyProperties["keyPassword"] as String
+                storeFile = file(keyProperties["storeFile"] as String)
+                storePassword = keyProperties["storePassword"] as String
+            }
         }
     }
 
     buildTypes {
         release {
-            signingConfig = signingConfigs.getByName("release")
+            if (keyPropertiesFile.exists()) {
+                signingConfig = signingConfigs.getByName("release")
+            }
         }
     }
 }