Suddenly our branches don't run CI/CD

GitLab CI/CD
1

Our master branch still runs fine, but suddenly no pipelines are started for branches.
When I go to the pipeline page and chose “Run Pipeline” and chose any branch I just get HTTP 500 error.

2

The CI Lint goes through fine. But no luck on branch CI/CD

2019-10-21-105629_304x666_scrot
2019-10-21-105629_304x666_scrot304×666 20.2 KB

3

got the same error (old branches works, new don’t)