Bench update --reset with error Could not fine Parent Item Group: All Item Groups

Hello.
I tried to update bench… with command:

bench update

But I have the problem:

Cannot proceed with update: You have local changes in app “erpnext” that are not committed.

And I used command:

bench update --reset

And then I have the error:

File “/home/erpuser/frappe-bench/apps/frappe/frappe/init.py”, line 455, in _raise_exception
raise raise_exception(msg)
msg = ‘Could not find Parent Item Group: All Item Groups’
raise_exception = <class ‘frappe.exceptions.LinkValidationError’>
…skipped… 1 vars
frappe.exceptions.LinkValidationError: Could not find Parent Item Group: All Item Groups
INFO: A newer version of bench is available: 5.14.4 → 5.23.0

I think it is problem in code, I opened also issue on Girhub: https://github.com/frappe/education/issues/305

What should I do?

git status

On branch version-14
Your branch is up to date with ‘upstream/version-14’.

Untracked files:
(use “git add …” to include in what will be committed)
www/book-appointment/
www/lms/macros/

nothing added to commit but untracked files present (use “git add” to track)

I don’t need these files! I do not changed anything. I just need update bench and erpnext.

Added later: I think it doesn’t matter for problem above. I just found resolve in another post.

I deleted it with command:

git clean -fd

now I can update with command bench update without --reset

but I have an error like in my first message!

Maybe because, I have names in tabCustomer Group on russian language?

Or should I check another tables?