diff --git a/lib/main.dart b/lib/main.dart
index d3aa075..f2eecbe 100644
--- a/lib/main.dart
+++ b/lib/main.dart
@@ -33,6 +33,11 @@ import 'utils/utils.dart';
 
 void main() {
   WidgetsFlutterBinding.ensureInitialized();
+  FlutterError.onError = (details) {
+    FlutterError.presentError(details);
+    print('CK_ERROR: ${details.exceptionAsString()}');
+    print('CK_STACK: ${details.stack}');
+  };
   // Enable configureApp will cause route problem.
   // configureApp();
   setPathUrlStrategy();
diff --git a/lib/widgets/desktop/desktop_checkout.dart b/lib/widgets/desktop/desktop_checkout.dart
index 12e3ff7..8fc9c84 100644
--- a/lib/widgets/desktop/desktop_checkout.dart
+++ b/lib/widgets/desktop/desktop_checkout.dart
@@ -306,7 +306,7 @@ class DesktopCheckoutState extends State<DesktopCheckout> with SingleTickerProvi
             mainAxisSize: MainAxisSize.min,
             children: [
               Text(
-                S.of(context).table_token(store.state.tableNumber!),
+                S.of(context).table_token(store.state.tableNumber ?? ''),
                 style: TextStyle(
                   fontSize: 20.0,
                   fontWeight: FontWeight.bold,
diff --git a/lib/widgets/mobile/mobile_checkout.dart b/lib/widgets/mobile/mobile_checkout.dart
index 6e0dfa0..92bda21 100644
--- a/lib/widgets/mobile/mobile_checkout.dart
+++ b/lib/widgets/mobile/mobile_checkout.dart
@@ -281,7 +281,7 @@ class MobileCheckoutState extends State<MobileCheckout> with SingleTickerProvide
             mainAxisSize: MainAxisSize.min,
             children: [
               Text(
-                S.of(context).table_token(store.state.tableNumber!),
+                S.of(context).table_token(store.state.tableNumber ?? ''),
                 style: TextStyle(
                   fontSize: 20.0,
                   fontWeight: FontWeight.bold,