diff --git a/starport_template/ios/fastlane/Fastfile b/starport_template/ios/fastlane/Fastfile
index e61c591c..d69849ac 100644
--- a/starport_template/ios/fastlane/Fastfile
+++ b/starport_template/ios/fastlane/Fastfile
@@ -43,7 +43,7 @@ platform :ios do
     )
 
     increment_build_number(
-      build_number: ENV["$GITHUB_RUN_NUMBER"]
+      build_number: ENV["GITHUB_RUN_NUMBER"]
     )
 
     build_app(
diff --git a/starport_template/lib/utils/base_env.dart b/starport_template/lib/utils/base_env.dart
index 77b4ae0d..8138ffb8 100644
--- a/starport_template/lib/utils/base_env.dart
+++ b/starport_template/lib/utils/base_env.dart
@@ -27,16 +27,30 @@ class BaseEnv {
   final String baseApiUrl;
 }
 
+// DO NOT USE String.fromEnvironment without 'const'!!!
+// https://github.com/flutter/flutter/issues/55870#issuecomment-620776138
 String get envLcdPort => const String.fromEnvironment('LCD_PORT', defaultValue: '1317');
 
+// DO NOT USE String.fromEnvironment without 'const'!!!
+// https://github.com/flutter/flutter/issues/55870#issuecomment-620776138
 String get envGrpcPort => const String.fromEnvironment('GRPC_PORT', defaultValue: '9090');
 
-String get envLcdUrl => String.fromEnvironment(
-      'LCD_URL',
-      defaultValue: Platform.isAndroid ? 'http://10.0.2.2' : 'http://localhost',
-    );
+String get envLcdUrl {
+  // DO NOT USE String.fromEnvironment without 'const'!!!
+  // https://github.com/flutter/flutter/issues/55870#issuecomment-620776138
+  const result = String.fromEnvironment('LCD_URL');
+  if (result.isEmpty) {
+    return Platform.isAndroid ? 'http://10.0.2.2' : 'http://localhost';
+  }
+  return result;
+}
 
-String get envGrpcUrl => String.fromEnvironment(
-      'GRPC_URL',
-      defaultValue: Platform.isAndroid ? 'http://10.0.2.2' : 'http://localhost',
-    );
+String get envGrpcUrl {
+  // DO NOT USE String.fromEnvironment without 'const'!!!
+  // https://github.com/flutter/flutter/issues/55870#issuecomment-620776138
+  const result = String.fromEnvironment('GRPC_URL');
+  if (result.isEmpty) {
+    return Platform.isAndroid ? 'http://10.0.2.2' : 'http://localhost';
+  }
+  return result;
+}