After spending some time looking into this, it appears that at some point, one of your assets is returning a nullptr for it’s world reference. Are you doing anything in your project that could be causing this?
Also, are you working in a blueprint or a c++ project?
I am marking this topic as resolved for tracking purposes, as we have not heard from you in a few days. If this issue persists, feel free to respond to this thread. For any new issues, please create a new Answerhub topic.
Go ahead and start a new thread in the Packaging & Deployment section and link it here when you have created it. I’ll follow up with you on that new thread.
I finally figured out that I hadn’t updated my Thirdperson Character .h and .cpp files from the UE4.14 templates and that was causing me a lot of trouble trying to update the project from 4.12 → 4.14.
So all good now, thanks very much for the support.