Index: jquery.autocomplete.js
===================================================================
--- jquery.autocomplete.js	(revision 5742)
+++ jquery.autocomplete.js	(working copy)
@@ -418,6 +418,7 @@
 	var length = 0;
 	
 	function matchSubset(s, sub) {
+		if (s.constructor === Function)	return false;
 		if (!options.matchCase) 
 			s = s.toLowerCase();
 		var i = s.indexOf(sub);
@@ -640,7 +641,7 @@
 		list.empty();
 		var max = limitNumberOfItems(data.length);
 		for (var i=0; i < max; i++) {
-			if (!data[i])
+			if (!data[i] || (data[i].value.constructor === Function))
 				continue;
 			var formatted = options.formatItem(data[i].data, i+1, max, data[i].value, term);
 			if ( formatted === false )