diff --git a/src/calibre/gui2/tweak_book/boss.py b/src/calibre/gui2/tweak_book/boss.py
index 7c61e9d146..a2b145944b 100644
--- a/src/calibre/gui2/tweak_book/boss.py
+++ b/src/calibre/gui2/tweak_book/boss.py
@@ -134,7 +134,7 @@ class Boss(QObject):
     @property
     def currently_editing(self):
         ' Return the name of the file being edited currently or None if no file is being edited '
-        return editor_name(self.gui.current_editor)
+        return editor_name(self.gui.central.current_editor)
 
     def preferences(self):
         orig_spell = tprefs['inline_spell_check']