fixed error in server mixup test

lib/main.dart

@@ -1,5 +1,6 @@
 import 'package:collection/collection.dart';
 import 'package:fluffychat/config/app_config.dart';
+import 'package:fluffychat/pangea/config/environment.dart';
 import 'package:fluffychat/pangea/controllers/language_list_controller.dart';
 import 'package:fluffychat/pangea/utils/error_handler.dart';
 import 'package:fluffychat/pangea/utils/firebase_analytics.dart';
@@ -105,13 +106,14 @@ Future<void> startGui(List<Client> clients, SharedPreferences store) async {
   // errors seems to happen a lot when users switch better production / staging
   // while testing by accident. If the account is a production account but server is
   // staging or vice versa, logout.
-  // final isStagingUser = firstClient?.userID?.domain?.contains("staging");
-  // final isStagingServer = Environment.isStaging;
-  // if (isStagingServer != isStagingUser) {
-  //   await firstClient?.logout();
-  // }
+  if (firstClient?.userID?.domain != null) {
+    final isStagingUser = firstClient!.userID!.domain!.contains("staging");
+    final isStagingServer = Environment.isStaging;
+    if (isStagingServer != isStagingUser) {
+      await firstClient.logout();
+    }
+  }
   // Pangea#
-
   runApp(FluffyChatApp(clients: clients, pincode: pin, store: store));
 }