fixed errors

Author: tb-rules10

lib/Pages/widgets/flood_snackbar.dart

@@ -54,7 +54,7 @@ SnackBar addFloodSnackBar(
               TextButton(
                 onPressed: undoFunction,
                 child: Text(
-                  undoText!,
+                  undoText ?? "Undo",
                   overflow: TextOverflow.ellipsis,
                   maxLines: 2,
                   style: TextStyle(