diff --git a/src/pyj/read_book/db.pyj b/src/pyj/read_book/db.pyj
index 0965112f6c..5512f46e26 100644
--- a/src/pyj/read_book/db.pyj
+++ b/src/pyj/read_book/db.pyj
@@ -172,11 +172,13 @@ class DB:
             transaction = self.idb.transaction(stores)
             req = transaction.objectStore(store).get(data)
             req.onsuccess = def(event):
-                proceed(req.result)
+                if proceed:
+                    proceed(req.result)
         elif op is 'put':
             transaction = self.idb.transaction(stores, 'readwrite')
             req = transaction.objectStore(store).put(data)
-            req.onsuccess = proceed
+            if proceed:
+                req.onsuccess = proceed
         req.onerror = def(event):
             self.display_error(error_msg, event)
 
@@ -327,7 +329,7 @@ class DB:
                             changed = True
                             book.annotations_map[unkey] = merged
                 if changed:
-                    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 get_file(self, book, name, proceed):