custom frontend item form broken after fc-update

hi there,

ok, this one is urgent i'm afraid (because it's live):

My customized frontend-item-form is broken since I updated Flexicontent from v3.1.0-rc2 to 3.1.1.

pressing the submit-button does not submit but produces "TypeError: a is null"

I get these error details:
TypeError: a is null[Weitere Informationen] core.js:1:1990
a.removeMessages [...]/media/system/js/core.js:1:1990
a.renderMessages [...]/media/system/js/core.js:1:1266
JFormValidator/isValid [...]/components/com_flexicontent/assets/js/validate.js:640:4
Joomla.submitform [...]/components/com_flexicontent/assets/js/admin.js:267:17
a.submitbutton [...]/media/system/js/core.js:1:415
flexi_submit [...]/components/com_flexicontent/assets/js/validate.js:808:2
<anonym> [...]/my-upload-page:1957:5
n.event.dispatch [...]/media/jui/js/jquery.min.js:3:12392
n.event.add/r.handle [...]/media/jui/js/jquery.min.js:3:9156

(i got into this situation because: the fc universal module didn't show well in BE (question was answered here: www.flexicontent.org/forum/21-troublesho...-backend-broken.html ))

Where do I have to edit my form.php? (the standard fc- form.php has some 1700 lines)

Thanks a lot!

Hello

that is a JS error when clicking submit

there is probably a JS error when the form loads
that is there JS error that is need

open browser tools , and go to JS console, and refresh the page
do you get a JS error on form load ?

no, I don't get Errors on load, but I do get an error on submit:
TypeError: a is null

[detail]
And that is because I have a form.php in /templates/{my_template}/html/com_flexicontent/item/
And there I found:

< script >
jQuery(function(){

// override save
jQuery('#flexi_form_submit_btns').find('.btn-success')
.attr('onclick', null)
.on('click', function(){
var b = jQuery('#adminForm').valid();
if(b==true)
{
flexi_submit('save', 'flexi_form_submit_btns', 'flexi_form_submit_msg');
}
})
;
// override save END

[...]