diff --git a/lib/ace/autocomplete.js b/lib/ace/autocomplete.js
index 8279b727..8800cab2 100644
--- a/lib/ace/autocomplete.js
+++ b/lib/ace/autocomplete.js
@@ -176,6 +176,9 @@ var Autocomplete = function() {
             var penalty = 0;
             var index, distance;
             // caption char iteration is faster in Chrome but slower in Firefox, so lets use indexOf
+            if (!caption) {
+                continue loop
+            }
             for (var j = 0; j < needle.length; j++) {
                 // TODO add penalty on case mismatch
                 var i1 = caption.indexOf(lower[j], lastIndex + 1);
@@ -302,4 +305,4 @@ var FilteredList = function(array, mutateData) {
 exports.Autocomplete = Autocomplete;
 exports.FilteredList = FilteredList;
 
-});
\ No newline at end of file
+});