diff --git a/lib/ace/autocomplete.js b/lib/ace/autocomplete.js
index dde0afd04ab..3bbb8899689 100644
--- a/lib/ace/autocomplete.js
+++ b/lib/ace/autocomplete.js
@@ -179,6 +179,8 @@ var Autocomplete = function() {
             data.completer.insertMatch(this.editor, data);
         } else {
             // TODO add support for options.deleteSuffix
+            if (!completions)
+                return false;
             if (completions.filterText) {
                 var ranges = this.editor.selection.getAllRanges();
                 for (var i = 0, range; range = ranges[i]; i++) {