diff --git a/chrome/content/zotero/xpcom/schema.js b/chrome/content/zotero/xpcom/schema.js
index cbcd61ecb..fda5008c5 100644
--- a/chrome/content/zotero/xpcom/schema.js
+++ b/chrome/content/zotero/xpcom/schema.js
@@ -1582,6 +1582,7 @@ Zotero.Schema = new function(){
 					Zotero.DB.query("DELETE FROM itemTags WHERE itemID NOT IN (SELECT itemID FROM items)");
 					Zotero.DB.query("DELETE FROM itemTags WHERE tagID NOT IN (SELECT tagID FROM tags)");
 					Zotero.DB.query("DELETE FROM savedSearchConditions WHERE savedSearchID NOT IN (select savedSearchID FROM savedSearches)");
+					Zotero.DB.query("DELETE FROM items WHERE itemTypeID IS NULL");
 					
 					Zotero.DB.query("DELETE FROM itemData WHERE valueID NOT IN (SELECT valueID FROM itemDataValues)");
 					Zotero.DB.query("DELETE FROM fulltextItemWords WHERE wordID NOT IN (SELECT wordID FROM fulltextWords)");