From c77b4518631d236f96334e13bd0649675b2a1e3c Mon Sep 17 00:00:00 2001
From: Jermolene <jeremy@osmosoft.com>
Date: Sun, 10 Nov 2013 19:21:37 +0000
Subject: [PATCH] Fixed bug when using checkbox widget to apply a tag to a
 tiddler that is untagged

---
 core/modules/widgets/checkbox.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/modules/widgets/checkbox.js b/core/modules/widgets/checkbox.js
index 6f32afdd7..07cb95a7a 100644
--- a/core/modules/widgets/checkbox.js
+++ b/core/modules/widgets/checkbox.js
@@ -62,7 +62,7 @@ CheckboxWidget.prototype.handleChangeEvent = function(event) {
 	var checked = this.inputDomNode.checked,
 		tiddler = this.wiki.getTiddler(this.checkboxTitle);
 	if(tiddler && tiddler.hasTag(this.checkboxTag) !== checked) {
-		var newTags = tiddler.fields.tags.slice(0),
+		var newTags = (tiddler.fields.tags || []).slice(0),
 			pos = newTags.indexOf(this.checkboxTag);
 		if(pos !== -1) {
 			newTags.splice(pos,1);