diff --git a/frontend/src/ts/ervu-dashboard/component/filter/DropdownTreeViewModelFilterValue.ts b/frontend/src/ts/ervu-dashboard/component/filter/DropdownTreeViewModelFilterValue.ts
index d7b99b17..904eb5ea 100644
--- a/frontend/src/ts/ervu-dashboard/component/filter/DropdownTreeViewModelFilterValue.ts
+++ b/frontend/src/ts/ervu-dashboard/component/filter/DropdownTreeViewModelFilterValue.ts
@@ -20,6 +20,9 @@ export class DropdownTreeViewModelFilterValue extends Behavior {
       model = treeViewComponent.cachedValue;
     }
     if (model) {
+      if (!model.parentId) {
+        return null;
+      }
       dtos.push(model);
       this.fillArray(dtos, model);
     }