Data too long for column 'url'

With:

• allianceauth 2.6.2
• django-esi 1.6.0
• discourse 2.4.0

When a user tries to log into discourse, the SSO redirect gives server error 500. This started happening yesterday.

Looking at the allianceauth.log, i can see this error:

[05/Mar/2020 23:56:56] ERROR [django.request:228] Internal Server Error: /sso/login
Traceback (most recent call last):
  File "/home/aauth/venv/aauth/lib/python3.5/site-packages/django/db/backends/utils.py", line 84, in _execute
    return self.cursor.execute(sql, params)
  File "/home/aauth/venv/aauth/lib/python3.5/site-packages/django/db/backends/mysql/base.py", line 71, in execute
    return self.cursor.execute(query, args)
  File "/home/aauth/venv/aauth/lib/python3.5/site-packages/MySQLdb/cursors.py", line 250, in execute
    self.errorhandler(self, exc, value)
  File "/home/aauth/venv/aauth/lib/python3.5/site-packages/MySQLdb/connections.py", line 50, in defaulterrorhandler
    raise errorvalue
  File "/home/aauth/venv/aauth/lib/python3.5/site-packages/MySQLdb/cursors.py", line 247, in execute
    res = self._query(query)
  File "/home/aauth/venv/aauth/lib/python3.5/site-packages/MySQLdb/cursors.py", line 412, in _query
    rowcount = self._do_query(q)
  File "/home/aauth/venv/aauth/lib/python3.5/site-packages/MySQLdb/cursors.py", line 375, in _do_query
    db.query(q)
  File "/home/aauth/venv/aauth/lib/python3.5/site-packages/MySQLdb/connections.py", line 276, in query
    _mysql.connection.query(self, query)
_mysql_exceptions.DataError: (1406, "Data too long for column 'url' at row 1")

The only table in the db with a url column is esi_callbackredirect:

CREATE TABLE `esi_callbackredirect` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `url` varchar(254) NOT NULL,
...

This is set here: https://gitlab.com/allianceauth/django-esi/-/blob/3048bf3f96a926a6c171d61f84efe79218953a91/esi/models.py#L171