diff --git a/qt/aqt/browser/find_duplicates.py b/qt/aqt/browser/find_duplicates.py
index 0211f8181..33d0c8c9a 100644
--- a/qt/aqt/browser/find_duplicates.py
+++ b/qt/aqt/browser/find_duplicates.py
@@ -79,6 +79,8 @@ class FindDuplicatesDialog(QDialog):
         self.show()
 
     def show_duplicates_report(self, dupes: list[tuple[str, list[NoteId]]]) -> None:
+        if sip.isdeleted(self):
+            return
         self._dupes = dupes
         if not self._dupesButton:
             self._dupesButton = b = self.form.buttonBox.addButton(