From a170210069bbec265992b365a61e0722b480ab1d Mon Sep 17 00:00:00 2001
From: Jeremy Ruston <jeremy@jermolene.com>
Date: Sat, 24 Aug 2019 11:39:00 +0100
Subject: [PATCH] Fix crash with action-deletefield and missing tiddler
 attribute

Fixes #4188
---
 core/modules/widgets/action-deletefield.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/modules/widgets/action-deletefield.js b/core/modules/widgets/action-deletefield.js
index ffe4ef5d0..45425bf4e 100644
--- a/core/modules/widgets/action-deletefield.js
+++ b/core/modules/widgets/action-deletefield.js
@@ -59,7 +59,7 @@ DeleteFieldWidget.prototype.invokeAction = function(triggeringWidget,event) {
 		tiddler = this.wiki.getTiddler(self.actionTiddler),
 		removeFields = {},
 		hasChanged = false;
-	if(this.actionField) {
+	if(this.actionField && tiddler) {
 		removeFields[this.actionField] = undefined;
 		if(this.actionField in tiddler.fields) {
 			hasChanged = true;