diff --git a/frontend/src/ts/ervu/component/grid/InMemoryStaticGrid.ts b/frontend/src/ts/ervu/component/grid/InMemoryStaticGrid.ts
index ec709b8..60d15c1 100644
--- a/frontend/src/ts/ervu/component/grid/InMemoryStaticGrid.ts
+++ b/frontend/src/ts/ervu/component/grid/InMemoryStaticGrid.ts
@@ -35,7 +35,7 @@ export class InMemoryStaticGrid extends GridV2 {
   protected initGrid() {
     super.initGrid();
     this.subscription = this.injector.get(ErvuDataService).message.subscribe(value => {
-      this.rowData = value[this.dataList];
+      this.rowData = value ? value[this.dataList] : null;
       this.initDeferred.promise.then(() => {
         this.refreshData();
       });