diff --git a/components/zotero-autocomplete.js b/components/zotero-autocomplete.js
index 4639b7ef4..f1b11eaba 100644
--- a/components/zotero-autocomplete.js
+++ b/components/zotero-autocomplete.js
@@ -88,6 +88,9 @@ ZoteroAutoComplete.prototype.startSearch = function(searchString, searchParam, p
 			statement = this._zotero.DB.getStatement(sql, sqlParams);
 			
 			var resultsCallback = function (results) {
+				if (!results) {
+					return;
+				}
 				var collation = self._zotero.getLocaleCollation();
 				results.sort(function(a, b) {
 					return collation.compareString(1, a.val, b.val);