Dedicated Server suddenly lagging and printing "ProcessLatentActions: CallbackTarget is None" log warnings

The dedicated server cmd and its log is getting spammed by this log message:

LogScript: Warning: FLatentActionManager::ProcessLatentActions: CallbackTarget is None.

There are no other errors/warnings except this one, and it doesnt tell me where its coming from, so I have no idea how I can fix it. I am using Blueprints only, and dont know where this error message is coming from, and searching for it on the forums doesnt really yield any results.

I was hoping somebody has any idea what this could mean, this would really help me out.

Thanks in advance!

Could you fix it by now? I have the same Problem.