Getting this Error while trying to create a manufacturing order. What is the issue?

Traceback (most recent call last):
  File "/home/odoo/src/odoo/saas-16.1/odoo/http.py", line 1680, in _serve_db
    return service_model.retrying(self._serve_ir_http, self.env)
  File "/home/odoo/src/odoo/saas-16.1/odoo/service/model.py", line 134, in retrying
    result = func()
  File "/home/odoo/src/odoo/saas-16.1/odoo/http.py", line 1707, in _serve_ir_http
    response = self.dispatcher.dispatch(rule.endpoint, args)
  File "/home/odoo/src/odoo/saas-16.1/odoo/http.py", line 1904, in dispatch
    result = self.request.registry['ir.http']._dispatch(endpoint)
  File "/home/odoo/src/odoo/saas-16.1/odoo/addons/base/models/ir_http.py", line 154, in _dispatch
    result = endpoint(**request.params)
  File "/home/odoo/src/odoo/saas-16.1/odoo/http.py", line 709, in route_wrapper
    result = endpoint(self, *args, **params_ok)
  File "/home/odoo/src/odoo/saas-16.1/addons/web/controllers/dataset.py", line 28, in call_kw
    return self._call_kw(model, method, args, kwargs)
  File "/home/odoo/src/odoo/saas-16.1/addons/web/controllers/dataset.py", line 24, in _call_kw
    return call_kw(request.env[model], method, args, kwargs)
  File "/home/odoo/src/odoo/saas-16.1/odoo/api.py", line 461, in call_kw
    result = _call_kw_multi(method, model, args, kwargs)
  File "/home/odoo/src/odoo/saas-16.1/odoo/api.py", line 448, in _call_kw_multi
    result = method(recs, *args, **kwargs)
  File "/home/odoo/src/odoo/saas-16.1/odoo/models.py", line 6560, in onchange
    snapshot1 = Snapshot(record, nametree)
  File "/home/odoo/src/odoo/saas-16.1/odoo/models.py", line 6320, in __init__
    self.fetch(name)
  File "/home/odoo/src/odoo/saas-16.1/odoo/models.py", line 6330, in fetch
    self[name] = record[name]
  File "/home/odoo/src/odoo/saas-16.1/odoo/models.py", line 5898, in __getitem__
    return self._fields[key].__get__(self, type(self))
  File "/home/odoo/src/odoo/saas-16.1/odoo/fields.py", line 2778, in __get__
    return super().__get__(records, owner)
  File "/home/odoo/src/odoo/saas-16.1/odoo/fields.py", line 1160, in __get__
    self.recompute(record)
  File "/home/odoo/src/odoo/saas-16.1/odoo/fields.py", line 1349, in recompute
    self.compute_value(recs)
  File "/home/odoo/src/odoo/saas-16.1/odoo/fields.py", line 1371, in compute_value
    records._compute_field_value(self)
  File "/home/odoo/src/odoo/saas-16.1/addons/mail/models/mail_thread.py", line 399, in _compute_field_value
    return super()._compute_field_value(field)
  File "/home/odoo/src/odoo/saas-16.1/odoo/models.py", line 4208, in _compute_field_value
    fields.determine(field.compute, self)
  File "/home/odoo/src/odoo/saas-16.1/odoo/fields.py", line 97, in determine
    return needle(*args)
  File "/home/odoo/src/odoo/saas-16.1/addons/mrp/models/mrp_production.py", line 477, in _compute_production_location
    production.production_location_id = location_by_company.get(production.company_id.id)[0]
TypeError: 'NoneType' object is not subscriptable

The above server error caused the following client error:
null