Uncaught TypeError: Cannot call method 'replace' of undefined

You can remove the script .. Its to alter form action incase a validation error comes

I got the same error, and removing the script indeed "solves" it.

I have got another issue, which I presume could be linked to the removal of the script however. The issue: when an error is given by a view (only tested views) loading via an ajax link (through this module), it does some strange things to the DOM as from that moment clicking on other ajax-links results in strange behavior (nothing loading, or stuff loading at the wrong place). Is my gut feeling that it's related correct? If so, can this issue be reopened?

Ps1: Can't give any url from the site as it's localhost development for the time being.

Thanks for the module btw, tried to make my own ajax module, and ran into problems... your module is definitely way better ;)

I've added this

if (formAction) {
}

End result now is:

if (formAction) {
formAction = formAction.replace("?ajax=1", "");
$("form").attr('action', formAction);
}

No errors + works with loading form validation. (i really needed that to work, axing the script breaks that)
Hope it helps.

Issue fixed and committed to 7.x-1.x-dev. Thanks to Rob