I'm trying to migrate a working piece of code from Odoo 12 to 13 and I'm getting the following error

2019-12-26 04:29:09,350 9128 INFO newodoo odoo.addons.base.models.ir_http: Generating routing map for key 1
2019-12-26 04:29:09,430 9128 WARNING newodoo odoo.addons.http_routing.models.ir_http: 403 Forbidden:

Traceback (most recent call last):
File "/home/Robert D'Zousa/Desktop/odoo13/odoo/api.py", line 753, in get
value = self._data[field][record._ids[0]]
KeyError: '8'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/home/Robert D'Zousa/Desktop/odoo13/odoo/fields.py", line 978, in __get__
value = env.cache.get(record, self)
File "/home/Robert D'Zousa/Desktop/odoo13/odoo/api.py", line 759, in get
raise CacheMiss(record, field)
odoo.exceptions.CacheMiss: ("maintenance.equipment('8',).company_id", None)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/home/Robert D'Zousa/Desktop/odoo13/odoo/fields.py", line 985, in __get__
recs._fetch_field(self)
File "/home/Robert D'Zousa/Desktop/odoo13/odoo/models.py", line 2930, in _fetch_field
self._read(fnames)
File "/home/Robert D'Zousa/Desktop/odoo13/odoo/models.py", line 3037, in _read
missing._ids, extras._ids,
odoo.exceptions.AccessError: ("Database fetch misses ids (('8',)) and has extra ids ((8,)), may be caused by a type incoherence in a previous request", None)

And this is the code. Could this be a problem associated with sudo, i've tried changing it to with_user, removed employee conditions and tried as superuser but still getting this error?

@http.route('/submit', method='post', type='http', auth='public', website=True, csrf=False)
def send_request(self, **post):
    """
    Searches for related employee of the currently logged in user.
    The maintenance request is only created if the logged in user is an employee
    """
    user = request.env.user.id
    employee = request.env['hr.employee'].sudo().search([('user_id', '=', user)])
    if employee:
        values = {
            'name': post['subject'],
            'maintenance_team_id': post['teams'],
            'equipment_id': post['equipment'],
            'description': post['details'],
            'priority': post['stars'],
            'employee_id': employee.id

        }
        request_id = request.env['maintenance.request'].sudo().create(values)
        template = request.env.ref('website_maintenance_hr.mail_template_maintenance_request')
        template.sudo().send_mail(request_id.id, force_send=True)

        return redirect('/maintenance_request-thanks')
    else:
        return redirect('/maintenance_request-nouser')