diff --git a/chrome/content/zotero/xpcom/fulltext.js b/chrome/content/zotero/xpcom/fulltext.js
index 25cc201d04..9095da363b 100644
--- a/chrome/content/zotero/xpcom/fulltext.js
+++ b/chrome/content/zotero/xpcom/fulltext.js
@@ -558,7 +558,7 @@ Zotero.Fulltext = new function(){
 	
 	
 	function indexItems(items, complete, ignoreErrors) {
-		if (Array.isArray(items)) {
+		if (!Array.isArray(items)) {
 			items = [items];
 		}
 		var items = Zotero.Items.get(items);