diff --git a/gajim/history_manager.py b/gajim/history_manager.py
index 62c3458079ff55f210073e2f0c6e2033dbf516f5..90fcd1a02b51cd606d098d0fb053a8fb709ab4d7 100644
--- a/gajim/history_manager.py
+++ b/gajim/history_manager.py
@@ -225,16 +225,19 @@ class HistoryManager:
 
     def on_history_manager_window_delete_event(self, widget, event):
         if not self.AT_LEAST_ONE_DELETION_DONE:
-            Gtk.main_quit()
+            if __name__ == '__main__':
+                Gtk.main_quit()
             return
 
         def on_yes(clicked):
             self.cur.execute('VACUUM')
             self.con.commit()
-            Gtk.main_quit()
+            if __name__ == '__main__':
+                Gtk.main_quit()
 
         def on_no():
-            Gtk.main_quit()
+            if __name__ == '__main__':
+                Gtk.main_quit()
 
         dialog = dialogs.YesNoDialog(
             _('Do you want to clean up the database? '