^{Originally posted by kazei92 March 19, 2026}
The problem is with this line:
datetime.datetime.fromisoformat(field_value) if format_ == ISO_8601

Line Link

in rest_framework\renderers.py.

If the field_value is an empty string '', a ValueError is raised.
Before 3.17.0 the empty date strings were supported.

I don't know if this is an issue or the null values are not handled properly.