update

packages/go_router_builder/lib/src/type_helpers.dart

@@ -417,7 +417,7 @@ abstract class _TypeHelperWithHelper extends _TypeHelper {
           '${helperName(paramType)})';
     }
     return '${helperName(paramType)}'
-        '(state.${_stateValueAccess(parameterElement, pathParameters)} ${!parameterElement.isRequired ? " ?? '' " : ''})!';
+        '(state.${_stateValueAccess(parameterElement, pathParameters)} ${!parameterElement.isRequired ? " ?? '' " : '!'})!';
   }
 }