mediatribe.net -- Drupal et développement web

I got this problem all of a sudden with three projects:

• I push commit 123456 to master

• Jenkins gives me this error:

  Checking out Revision 123456 (origin/master) FATAL: Could not checkout null with start point 123456

For each project I logged into the jenkins server

sudo su jenkins
cd /var/lib/jenkins/workspace/myproject
git status
# Not currently on any branch.
nothing to commit (working directory clean)
git checkout master
git pull origin master

This worked for two of my projects. On the third, I got:

git checkout master
fatal: object 234567 is corrupted

I simply deleted the directory and re-cloned it from source, and it started working again

I just did this a few minutes ago, so I'll check in again tomorrow to see if the problem resurfaces.