When I create an ACL table according to the Postman:
PUT /restconf/config/vpp-classifier:vpp-classifier/classify-table/acl_table_test
{
"name": "acl_table_test",
"nbuckets": 2,
"memory_size": 1048576,
"miss_next": "permit",
"mask": "00:00:00:00:00:00:ff:ff:ff:ff:ff:ff:00:00:00:00"
}

And I try to read operational data for this table:
GET /restconf/operational/vpp-classifier:vpp-classifier-state/classify-table/acl_table_test

The response is: Status code 500; Caused by NullPointerException
Full log included in attachments.