bacs not working

Hi,

I have problem with checkout page using ‘BACS’ as payment method.
Returns error 500 in inspector ‘Network panel’ and console shows error in checkout.min.js http://imgur.com/DLMH7Do

I have placed unimified version of checkout to see where is problem, and it is with ‘AJAX Form Submission’ which is processing order.
http://imgur.com/x4iOI6V

I dont know how to debug this, but something is wrong.
Ii have deactivated all plugins and dequeued all scripts from theme, and it still returns error 500.

https://wordpress.org/plugins/woocommerce/