I think I found a solution for this error – at least until an official patch is released:
Line 228 of js/jquery-colorbox-wrapper.js should have && instead of || :
if(ColorboxLocal.colorboxGroupId !== undefined && ColorboxLocal.colorboxGroupId !== null) {
In js/jquery-colorbox-wrapper-min.js search for this string:
if(ColorboxLocal.colorboxGroupId!==undefined||ColorboxLocal.colorboxGroupId!==null)
and replace with this one:
if(ColorboxLocal.colorboxGroupId!==undefined&&ColorboxLocal.colorboxGroupId!==null)
That *should* work. ??