AttributeError: 'NoneType' object has no attribute 'exchange'

[PromiseFru]

Traceback (most recent call last):
  File "/vault/src/grpc_entity_service.py", line 609, in ListEntityStoredTokens
    entity_obj, llt_error_response = self.handle_long_lived_token_validation(
                                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
        request, context, response
        ^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/vault/src/grpc_entity_service.py", line 304, in handle_long_lived_token_validation
    _, token_error = validate_long_lived_token(llt, entity_obj)
                     ~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
  File "/vault/src/grpc_entity_service.py", line 280, in validate_long_lived_token
    entity_device_id_shared_key = entity_device_id_keypair.agree(
        base64.b64decode(entity_obj.client_device_id_pub_key),
    )
  File "/usr/local/lib/python3.13/site-packages/smswithoutborders_libsig/keypairs.py", line 191, in agree
    shared_key = x.exchange(X25519PublicKey.from_public_bytes(public_key))
                 ^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'exchange'
2025-06-13 10:30:01,606 - vault.grpc.server - ERROR - /vault.v1.Entity/ListEntityStoredTokens HTTP/2.0 - INTERNAL -