MySQL Error 1054: Unknown column

Hi,
I’m getting MySQL error 1054 when I hover over document name in custom doctype.
Problem is caused by child table “fw_modules”.

pymysql.err.InternalError: (1054, "Unknown column 'fw_modules' in 'field list'")

Here’s deleted document

{
 "creation": "2021-10-08 23:54:44.414600",
 "docstatus": 0,
 "doctype": "Firmware",
 "firmware_description": null,
 "fw_file": "/private/files/Snippets.txt",
 "fw_modules": [
  {
   "active": 1,
   "creation": "2021-10-08 23:54:44.414600",
   "docstatus": 0,
   "doctype": "Firmware Module",
   "idx": 1,
   "item_code": "21-0205",
   "item_description": "Test FW 123",
   "item_name": "Test FW Module",
   "modified": "2021-10-09 00:38:22.319727",
   "modified_by": "****",
   "name": "6a5be850c9",
   "note": null,
   "owner": "*****",
   "parent": "FW-025/2110",
   "parentfield": "fw_modules",
   "parenttype": "Firmware"
  }
 ],
 "fw_name": "Test FW #7",
 "fw_status": "Beta",
 "idx": 0,
 "modified": "2021-10-09 00:38:22.319727",
 "modified_by": "*****",
 "name": "FW-025/2110",
 "naming_series": "FW-.###./.YY..MM",
 "owner": "******",
 "parent": null,
 "parentfield": null,
 "parenttype": null
}

Here’s images of main doctype and child table doctype

This is traceback from console

jquery.min.js:4 
 POST http://192.168.1.111/api/method/frappe.desk.link_preview.get_preview_data 500 (INTERNAL SERVER ERROR)
request.js:355 Traceback (most recent call last):
  File "/home/frappe/frappe-bench/apps/frappe/frappe/app.py", line 67, in application
    response = frappe.api.handle()
  File "/home/frappe/frappe-bench/apps/frappe/frappe/api.py", line 59, in handle
    return frappe.handler.handle()
  File "/home/frappe/frappe-bench/apps/frappe/frappe/handler.py", line 24, in handle
    data = execute_cmd(cmd)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/handler.py", line 64, in execute_cmd
    return frappe.call(method, **frappe.form_dict)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/__init__.py", line 1075, in call
    return fn(*args, **newargs)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/desk/link_preview.py", line 27, in get_preview_data
    }, fields=preview_fields, limit=1)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/__init__.py", line 1311, in get_list
    return frappe.model.db_query.DatabaseQuery(doctype).execute(None, *args, **kwargs)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/model/db_query.py", line 96, in execute
    result = self.build_and_run()
  File "/home/frappe/frappe-bench/apps/frappe/frappe/model/db_query.py", line 130, in build_and_run
    return frappe.db.sql(query, as_dict=not self.as_list, debug=self.debug, update=self.update)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/database/database.py", line 171, in sql
    self._cursor.execute(query)
  File "/home/frappe/frappe-bench/env/lib/python3.6/site-packages/pymysql/cursors.py", line 170, in execute
    result = self._query(query)
  File "/home/frappe/frappe-bench/env/lib/python3.6/site-packages/pymysql/cursors.py", line 328, in _query
    conn.query(q)
  File "/home/frappe/frappe-bench/env/lib/python3.6/site-packages/pymysql/connections.py", line 517, in query
    self._affected_rows = self._read_query_result(unbuffered=unbuffered)
  File "/home/frappe/frappe-bench/env/lib/python3.6/site-packages/pymysql/connections.py", line 732, in _read_query_result
    result.read()
  File "/home/frappe/frappe-bench/env/lib/python3.6/site-packages/pymysql/connections.py", line 1075, in read
    first_packet = self.connection._read_packet()
  File "/home/frappe/frappe-bench/env/lib/python3.6/site-packages/pymysql/connections.py", line 684, in _read_packet
    packet.check_error()
  File "/home/frappe/frappe-bench/env/lib/python3.6/site-packages/pymysql/protocol.py", line 220, in check_error
    err.raise_mysql_exception(self._data)
  File "/home/frappe/frappe-bench/env/lib/python3.6/site-packages/pymysql/err.py", line 109, in raise_mysql_exception
    raise errorclass(errno, errval)
pymysql.err.InternalError: (1054, "Unknown column 'fw_modules' in 'field list'")
utils.js:586 
 Uncaught (in promise) DOMException: play() failed because the user didn't interact with the document first.
play_sound	@	utils.js:586
500	@	request.js:182
(anonymous)	@	request.js:267
i	@	jquery.min.js:2
fireWith	@	jquery.min.js:2
z	@	jquery.min.js:4
(anonymous)	@	jquery.min.js:4
load (async)		
send	@	jquery.min.js:4
ajax	@	jquery.min.js:4
frappe.request.call	@	request.js:219
frappe.call	@	request.js:91
(anonymous)	@	request.js:14
frappe.xcall	@	request.js:13
get_preview_data	@	link_preview.js:135
create_popover	@	link_preview.js:70
(anonymous)	@	link_preview.js:51
setTimeout (async)		
setup_popover_control	@	link_preview.js:50
(anonymous)	@	link_preview.js:20
dispatch	@	jquery.min.js:3
r.handle	@	jquery.min.js:3

ERPNext: v12.23.0 (version-12)
Frappe Framework: v12.20.0 (version-12)

Updating to last version(from v12 branch) does not solve the problem.

Anyone?