ERP get stuck when I submit a 'Work Order'


I have some problems with adding a new Work Order. I already added other work orders successfully, but now my site is getting stuck when i want to add a new one. I have installed ERPNEXT [v12.x.x-develop () (develop)] on my local server on Debian . Frappe Framework: v12.x.x-develop () (develop) . The site is set in production mode.

Here is my web error log.

Can someone give me some advice how to solve this problem?

UPDATE: I switched to branch version-12 of ERPNext and Frappe and my problem was solved.