When executing query like 

curl http://localhost:8000/api/ibexa/v2/corporate/companies/71/members?filter[IsUserEnabledCriterion]\=true 

there's 501 error:

<errorDescription>Intentionally not implemented: No visitor available for: Ibexa\Contracts\Core\Repository\Values\Content\Query\Criterion\IsUserEnabled with operator =</errorDescription> 

Steps to reproduce:

1. Have company with members
2. Execute rest api request like above (where 71 is companyId)

Expected behaviour:

Request returns correct results

Current behaviour:

Request returns error