Log Error: Could not find project 'null'. Verify url is correct and project is published

We get Routes Log Errors. See below example:

Routes 22Mar2022 09:43:59 Could not find project ‘null’. Verify url is correct and project is published.

We cannot figure out which project this is for. When opening magnifying glass for log properties we only see route-group perspective and route-path/client project_name

Is there a way to troubleshoot this?