PostReceive not working properly

Ever since we upgraded to 9.3.3 our pipelines do not seem to be auto-starting

I have looked in the sidekiq console and found there are several dead jobs corresponding to the pipelines not starting.

They all look like the following:

Queue: post_receive

Job: PostReceive

Arguments: nil, "user-2", "ZTM5ZTYxOWI0Nzg1ZDhkMGUzYjllMjgyN2VkNzlkMzhjN2Q3MmExOSA2NGM0\nMmU0ZjAxYzA2MThjZTYyNjE2ZThiZmRkMjYyMWRhNzM3OWJhIHJlZnMvaGVh\nZHMvc3RhZ2luZwo=\n"

Error: NoMethodError: undefined method `start_with?' for nil:NilClass

We use a standard omnibus deploy on a Ubutnu 16.04.2 server

I have tried a reconfigure and restart.

I am not sure if this has been fixed here: https://gitlab.com/gitlab-org/gitlab-ce/issues/34502

ZD: https://gitlab.zendesk.com/agent/tickets/79640

cc// @zj