diff --git a/packages/kb.gbapp/services/KBService.ts b/packages/kb.gbapp/services/KBService.ts
index 6b515d28..f240c469 100644
--- a/packages/kb.gbapp/services/KBService.ts
+++ b/packages/kb.gbapp/services/KBService.ts
@@ -458,7 +458,7 @@ export class KBService implements IGBKBService {
     // when loading worksheets collection.
 
     let worksheet = data;
-    if (!worksheet) {
+    if (!worksheet._rows) {
       for (let t = 0; t < data.worksheets.length; t++) {
         worksheet = data.worksheets[t];
         if (worksheet) {