diff --git a/example/lib/non_tc_screen.dart b/example/lib/non_tc_screen.dart
index 93237c3..9a2fb00 100644
--- a/example/lib/non_tc_screen.dart
+++ b/example/lib/non_tc_screen.dart
@@ -380,7 +380,9 @@ class _HomePageState extends State<HomePage> {
     if (streamSubscription != null) {
       streamSubscription.cancel();
     }
-    _timer.cancel();
+    if (_timer != null) {
+      _timer.cancel();
+    }
     super.dispose();
   }
 }