Patch proposal for https://github.com/medialize/jQuery-contextMenu/issues/132 It wraps a bunch of layerClick() code inside a "!fakeClick" condition.

jquery.contextMenu.js.patch

Index: jquery.contextMenu.js
===================================================================
--- jquery.contextMenu.js                 (revision 6957)
+++ jquery.contextMenu.js	(working copy)
@@ -351,6 +351,7 @@
                 button = e.button,
                 x = e.pageX,
                 y = e.pageY,
+                fakeClick = x === undefined,
                 target, 
                 offset,
                 selectors;
@@ -359,6 +360,7 @@
             e.stopImmediatePropagation();
             
             setTimeout(function() {
+                if (!fakeClick) {
                 var $window, hideshow, possibleTarget;
                 var triggerAction = ((root.trigger == 'left' && button === 0) || (root.trigger == 'right' && button === 2));
                 
@@ -403,6 +405,7 @@
                         $(target).contextMenu({x: x, y: y});
                     });
                 }
+                }
 
                 root.$menu.trigger('contextmenu:hide');
             }, 50);

It's been like 4 years since you posted this and the error still exist. Thanks for the patch, you saved me hours, if not days, of work!