diff --git a/src/pyj/read_book/db.pyj b/src/pyj/read_book/db.pyj
index 5512f46e26..079735e629 100644
--- a/src/pyj/read_book/db.pyj
+++ b/src/pyj/read_book/db.pyj
@@ -301,11 +301,11 @@ class DB:
         if book.metadata:
             for key in Object.keys(new_metadata):
                 book.metadata[key] = new_metadata[key]
-            self.do_op(['books'], book, _('Failed to write to the books database'), op='put')
+            self.do_op(['books'], book, _('Failed to write to the books database'), def(): None;, op='put')
 
     def save_reading_rates(self, book, rates):
         book.saved_reading_rates = rates
-        self.do_op(['books'], book, _('Failed to write to the books database'), op='put')
+        self.do_op(['books'], book, _('Failed to write to the books database'), def(): None;, op='put')
 
     def update_annotations_data_from_key(self, library_id, book_id, fmt, new_data):
         unkey = username_key(get_interface_data().username)