Improvements

lib/controllers/providers/api/device_transfer_provider.dart

@@ -64,7 +64,7 @@ class DeviceTransferProvider extends ChangeNotifier {
   }) async {
     if (isLoading == true) return -2;
     isLoading = true;
-    notifyListeners();
+    if (items?.isEmpty ?? true) notifyListeners();
     Response response;
     try {
       Map<String, dynamic> body = {};

lib/controllers/providers/api/gas_refill_provider.dart

@@ -52,7 +52,7 @@ class GasRefillProvider extends ChangeNotifier {
   }) async {
     if (isLoading == true) return -2;
     isLoading = true;
-    notifyListeners();
+    if (items?.isEmpty ?? true) notifyListeners();
     Response response;
 
     Map<String, dynamic> body = {};