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I was able to see a similar null pointer exception if I disabled the credentials plugin while the git plugin and the git client plugin were both enabled. When I restarted Jenkins, it failed to restart with the null pointer exception.
After doing that, I removed plugins/credentials.jpi.disabled and restarted Jenkins. It started correctly. The credentials plugin must be enabled for the git plugin or the git client plugin (or both).
There may need to be some core extension which will allow a plugin to explicitly declare that it depends on another plugin being enabled.