diff --git a/prefs.py b/prefs.py
index 95612e6a..69f7140c 100644
--- a/prefs.py
+++ b/prefs.py
@@ -1157,4 +1157,5 @@ class PreferencesDialog(tk.Toplevel):
             except Exception:
                 AXIsProcessTrustedWithOptions({kAXTrustedCheckOptionPrompt: True})
 
-            self.parent.event_generate('<<Quit>>', when="tail")
+            if not config.shutting_down():
+                self.parent.event_generate('<<Quit>>', when="tail")