diff --git a/marking_app/lib/routes/RouterManager.dart b/marking_app/lib/routes/RouterManager.dart
index b1f0997..e46123c 100644
--- a/marking_app/lib/routes/RouterManager.dart
+++ b/marking_app/lib/routes/RouterManager.dart
@@ -184,9 +184,9 @@ class RouterManager {
   static final _jobReportPageHandler = Handler(handlerFunc: (BuildContext? context, Map<String, List<String>> params) {
     int id = int.parse(params['id']![0]);
     String title = params['title']![0];
-    int schoolId = int.parse(params['schoolId']![0]);
-    int gradeId = int.parse(params['gradeId']![0]);
-    String className = params['className']![0];
+    int? schoolId = int.parse(params['schoolId']![0]);
+    int? gradeId = int.parse(params['gradeId']![0]);
+    String? className = params['className']![0];
     return JobReport(id: id, title: title,schoolId:schoolId,gradeId:gradeId,className:className);
   });