I am facing this issue "unknown error(cannot read the properties of null ('reading slug'))" while deploying OAS through github. could someone help me to resolve this issue

I am facing this issue "unknown error(cannot read the properties of null ('reading slug'))" while deploying OAS through github. could someone help me to resolve this issue.

As a developer, I am working on documentation for API changes. Due to support of multiple base URL's, I upgraded to OAS 3.0 from OAS 2.0. After that I started facing this issue. If i update readme keys (API_DEFINITION_KEY & Readme key), then the build is successfull. But after deploying few more changes suddenly this issue replicating. I did validating my OAS file using swagger editor and no error in it. could you pleae reproduce this isssue on your side and provide me the solution.