One project failed its last repository check

Hi I got this error and don’t know really how to fix this:

error: refs/pipelines/13714: invalid sha1 pointer 0000000000000000000000000000000000000000

It does not look like a big issue since error is in a reference to a pipeline and those are used to build the CI environments and can be safely deleted I think but I would be sleeping better if fsck check comes back clean instead.
If anyone could please assist me it will be much appreciated.
There is also a number of dangling commits and blobs that I would like to know how to fix you can see the full repocheck.log output in the link below

http://ix.io/2KXX

When checking for the pipeline I found this empty file

I have tested deleting the pipeline (in a cloned VM) using the Gitlab API but when running the fsck still gives the same error.

Any ideas on how to fix this?
Can someone point me to documentation or howtos to fix this?