Seems at times if you are grepping a lot of these in your log messages
(Symptoms could be that jenkins is not processing your pull requests not is it displaying anything on your github)
SEVERE: Helper is null and Project is not disabled, unable to run trigger
Well it seems, if such a thing happens, ensuring that you have your Github project properly defined in your jenkins configuration is the issue. If it is not properly defined, then you will be getting this (e.g if it is blank).
What if you keep getting the issue despite changing it??
That’ll probably be because you are a moron, 😀 you should restart jenkins (restart safely) once you did any of those changes.