Error 500 on public gitblab website + repo corruption messages

Hello,
I’m currently using the public gitlab server on gitlab.com.
From recently, when try to fetch one of the branch of one of my project, I get these errors:

git fetch --progress --prune --no-tags origin
git upload-pack: git-pack-objects died with error.
git upload-pack: aborting due to possible repository corruption on the remote side.
remote: error: Could not read 29c9a4ea261d076565f2a79e4376bf95f1b18f84
remote: fatal: revision walk setup failed
remote: aborting due to possible repository corruption on the remote side.
protocol error: bad pack header
git upload-pack: git-pack-objects died with error.
git upload-pack: aborting due to possible repository corruption on the remote side.
protocol error: bad pack header

And when I try to browse the branch using the webapp, I get a 500 Error.
Idem when I try to see commits or files of this branch.
All other branches work perfectly, and I do have all permissions on this repo (it’s mine).

What should I do, please?
Thanks!
Balto