Ticket #17144: 17144.close-if-can.patch

wp-includes/js/quicktags.dev.js

@@ -570 +570 @@
 
         qt.closeAllTags = function(editor_id) {
                 var ed = this.getInstance(editor_id), btn = ed.getButton('close');
+                if ( typeof btn  != 'undefined' )
                 btn.callback.call(btn, '', ed.canvas, ed);
         };