diff --git a/core/modules/widgets/navigator.js b/core/modules/widgets/navigator.js
index eef275089..24a10ac9f 100755
--- a/core/modules/widgets/navigator.js
+++ b/core/modules/widgets/navigator.js
@@ -211,6 +211,10 @@ NavigatorWidget.prototype.handleCloseOtherTiddlersEvent = function(event) {
 
 // Place a tiddler in edit mode
 NavigatorWidget.prototype.handleEditTiddlerEvent = function(event) {
+	var editTiddler = $tw.hooks.invokeHook("th-editing-tiddler",event);
+	if(!editTiddler) {
+		return false;
+	}
 	var self = this;
 	function isUnmodifiedShadow(title) {
 		return self.wiki.isShadowTiddler(title) && !self.wiki.tiddlerExists(title);