Odoo Server Error
Traceback (most recent call last):
  File "/home/odoo/src/odoo/13.0/odoo/http.py", line 624, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
  File "/home/odoo/src/odoo/13.0/odoo/http.py", line 310, in _handle_exception
    raise pycompat.reraise(type(exception), exception, sys.exc_info()[2])
  File "/home/odoo/src/odoo/13.0/odoo/tools/pycompat.py", line 14, in reraise
    raise value
  File "/home/odoo/src/odoo/13.0/odoo/http.py", line 669, in dispatch
    result = self._call_function(**self.params)
  File "/home/odoo/src/odoo/13.0/odoo/http.py", line 350, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "/home/odoo/src/odoo/13.0/odoo/service/model.py", line 93, in wrapper
    return f(dbname, *args, **kwargs)
  File "/home/odoo/src/odoo/13.0/odoo/http.py", line 339, in checked_call
    result = self.endpoint(*a, **kw)
  File "/home/odoo/src/odoo/13.0/odoo/http.py", line 915, in __call__
    return self.method(*args, **kw)
  File "/home/odoo/src/odoo/13.0/odoo/http.py", line 515, in response_wrap
    response = f(*args, **kw)
  File "/home/odoo/src/odoo/13.0/addons/web/controllers/main.py", line 1322, in call_kw
    return self._call_kw(model, method, args, kwargs)
  File "/home/odoo/src/odoo/13.0/addons/web/controllers/main.py", line 1314, in _call_kw
    return call_kw(request.env[model], method, args, kwargs)
  File "/home/odoo/src/odoo/13.0/odoo/api.py", line 387, in call_kw
    result = _call_kw_multi(method, model, args, kwargs)
  File "/home/odoo/src/odoo/13.0/odoo/api.py", line 374, in _call_kw_multi
    result = method(recs, *args, **kwargs)
  File "/home/odoo/src/odoo/13.0/addons/base_vat/models/res_partner.py", line 487, in write
    return super(ResPartner, self).write(values)
  File "/home/odoo/src/odoo/13.0/addons/snailmail/models/res_partner.py", line 24, in write
    return super(ResPartner, self).write(vals)
  File "/home/odoo/src/odoo/13.0/addons/partner_autocomplete/models/res_partner.py", line 197, in write
    res = super(ResPartner, self).write(values)
  File "/home/odoo/src/odoo/13.0/odoo/addons/base/models/res_partner.py", line 533, in write
    partner._fields_sync(vals)
  File "/home/odoo/src/odoo/13.0/odoo/addons/base/models/res_partner.py", line 453, in _fields_sync
    self._children_sync(values)
  File "/home/odoo/src/odoo/13.0/odoo/addons/base/models/res_partner.py", line 462, in _children_sync
    self._commercial_sync_to_children()
  File "/home/odoo/src/odoo/13.0/odoo/addons/base/models/res_partner.py", line 435, in _commercial_sync_to_children
    res = sync_children.write(sync_vals)
  File "/home/odoo/src/odoo/13.0/addons/base_vat/models/res_partner.py", line 485, in write
    country_id = values.get('country_id', self.country_id.id)
  File "/home/odoo/src/odoo/13.0/odoo/fields.py", line 3535, in __get__
    raise ValueError("Expected singleton: %s" % record)
ValueError: Expected singleton: res.country(20, 75)