diff --git a/src/calibre/gui2/convert/search_and_replace.py b/src/calibre/gui2/convert/search_and_replace.py
index 2a5314eabf..1bedf9cf31 100644
--- a/src/calibre/gui2/convert/search_and_replace.py
+++ b/src/calibre/gui2/convert/search_and_replace.py
@@ -4,6 +4,7 @@ __docformat__ = 'restructuredtext en'
 
 import codecs
 import json
+from contextlib import suppress
 
 from qt.core import Qt, QTableWidgetItem
 
@@ -167,7 +168,8 @@ class SearchAndReplaceWidget(Widget, Ui_Form):
     def break_cycles(self):
         Widget.break_cycles(self)
 
-        self.sr_search.doc_update.disconnect(self.update_doc)
+        with suppress(TypeError):
+            self.sr_search.doc_update.disconnect(self.update_doc)
         self.sr_search.break_cycles()
 
     def update_doc(self, doc):