Nested ArrayField with nullable base field generates invalid SQL

[Josef Kolář]

When I have model

class NestedNullableIntegerArrayModel(PostgreSQLModel):
    field = ArrayField(ArrayField(models.IntegerField(null=True)))

and trying to save data

instance = NestedNullableIntegerArrayModel(field=[[None, None], [None, None]])
    instance.save()

and Django generates

Error: Failed to load processor SQL

No macro or processor named 'SQL' found