diff --git a/services/document-updater/app/js/DocumentManager.js b/services/document-updater/app/js/DocumentManager.js
index 2ed9c2cfeb..f889016140 100644
--- a/services/document-updater/app/js/DocumentManager.js
+++ b/services/document-updater/app/js/DocumentManager.js
@@ -222,7 +222,7 @@ const DocumentManager = {
       version,
       ranges,
       lastUpdatedAt,
-      lastUpdatedBy
+      lastUpdatedBy || null
     )
     await RedisManager.promises.clearUnflushedTime(docId)
     return result