| Traceback (most recent call last):
| File "/path/to/.venv/lib/python3.12/site-packages/paperqa/agents/search.py", line 487, in process_file
| await tmp_docs.aadd(
| File "/path/to/.venv/lib/python3.12/site-packages/paperqa/docs.py", line 364, in aadd
| doc = await metadata_client.upgrade_doc_to_doc_details(
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| File "/path/to/.venv/lib/python3.12/site-packages/paperqa/clients/__init__.py", line 207, in upgrade_doc_to_doc_details
| 0 if not extra_fields else DocDetails(**extra_fields)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^
| File "/path/to/.venv/lib/python3.12/site-packages/pydantic/main.py", line 212, in __init__
| validated_self = self.__pydantic_validator__.validate_python(data, self_instance=self)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| File "/path/to/.venv/lib/python3.12/site-packages/paperqa/types.py", line 577, in validate_all_fields
| data = cls.remove_invalid_authors(data)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| File "/path/to/.venv/lib/python3.12/site-packages/paperqa/types.py", line 458, in remove_invalid_authors
| a for a in authors if a.lower() not in cls.AUTHOR_NAMES_TO_REMOVE
| ^^^^^^^
| AttributeError: 'NoneType' object has no attribute 'lower'
+------------------------------------
Seen last night when indexing 19k PDFs: