diff --git a/sao/src/window.js b/sao/src/window.js
index 15e806b75f..8871e64a9b 100644
--- a/sao/src/window.js
+++ b/sao/src/window.js
@@ -416,7 +416,9 @@
                 }
             }
             let message = name + '/' + Sao.common.humanize(size);
-            this.label.text(message).attr('title', message);
+            if (this.label) {
+                this.label.text(message).attr('title', message);
+            }
             this._set_button_sensitive();
         },
         record_modified: function() {
diff --git a/tryton/tryton/gui/window/win_form.py b/tryton/tryton/gui/window/win_form.py
index b418bfd68d..8edf436f9f 100644
--- a/tryton/tryton/gui/window/win_form.py
+++ b/tryton/tryton/gui/window/win_form.py
@@ -365,7 +365,8 @@ class WinForm(NoModal, InfoBar):
         if selected > 1:
             name += '#%i' % selected
         name = '(%s/%s)' % (name, common.humanize(size))
-        self.label.set_text(name)
+        if hasattr(self, 'label'):
+            self.label.set_text(name)
         self._set_button_sensitive()
 
     def record_modified(self, *args):