diff --git a/apps/common/main/lib/view/Header.js b/apps/common/main/lib/view/Header.js
index c5f61886c2..90df5d8e55 100644
--- a/apps/common/main/lib/view/Header.js
+++ b/apps/common/main/lib/view/Header.js
@@ -1261,6 +1261,7 @@ define([
             },
 
             setDocTitle: function(name){
+                if (!$labelDocName) return;
                 var width = this.getTextWidth(name || $labelDocName.val());
                 (width>=0) && $labelDocName.width(width);
                 name && (width>=0) && $labelDocName.val(name);