Fixed problem with retrieving non-existent list tiddlers

core/modules/wiki.js

@@ -358,7 +358,7 @@ Return the content of a tiddler as an array containing each line
 */
 exports.getTiddlerList = function(title) {
 	var tiddler = this.getTiddler(title);
-	if(tiddler.fields.text && tiddler.fields.text.length > 0) {
+	if(tiddler && tiddler.fields.text && tiddler.fields.text.length > 0) {
 		return tiddler.fields.text.split("\n");
 	}
 	return [];