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TypeError: get_sort_key() missing 1 required positional argument: 'ctx'

See original GitHub issue

What this might mean? I have no idea how to fix this. Or is it a bug in the peewee code?

  File "/Users/Vic/projects/brain2/brain/utils/reports/bi.py", line 449, in sync_author_tasks
    BIAuthorTask.insert_many(author_tasks).on_conflict_replace().execute()
  File "/Users/Vic/projects/brain2/venv/lib/python3.6/site-packages/peewee.py", line 1560, in inner
    return method(self, database, *args, **kwargs)
  File "/Users/Vic/projects/brain2/venv/lib/python3.6/site-packages/peewee.py", line 1631, in execute
    return self._execute(database)
  File "/Users/Vic/projects/brain2/venv/lib/python3.6/site-packages/peewee.py", line 2274, in _execute
    return super(Insert, self)._execute(database)
  File "/Users/Vic/projects/brain2/venv/lib/python3.6/site-packages/peewee.py", line 2049, in _execute
    cursor = database.execute(self)
  File "/Users/Vic/projects/brain2/venv/lib/python3.6/site-packages/peewee.py", line 2637, in execute
    sql, params = ctx.sql(query).query()
  File "/Users/Vic/projects/brain2/venv/lib/python3.6/site-packages/peewee.py", line 549, in sql
    return obj.__sql__(self)
  File "/Users/Vic/projects/brain2/venv/lib/python3.6/site-packages/peewee.py", line 2258, in __sql__
    self._generate_insert(self._insert, ctx)
  File "/Users/Vic/projects/brain2/venv/lib/python3.6/site-packages/peewee.py", line 2181, in _generate_insert
    columns = sorted(accum, key=lambda obj: obj.get_sort_key(ctx))
  File "/Users/Vic/projects/brain2/venv/lib/python3.6/site-packages/peewee.py", line 2181, in <lambda>
    columns = sorted(accum, key=lambda obj: obj.get_sort_key(ctx))
TypeError: get_sort_key() missing 1 required positional argument: 'ctx'