I have crash with message after play about half minute in my build. Remove this object (Vehicle) from map and rebuild fix this crash. This Vehicle object is BP class with and project hat inclusive nativize.
I think you will check null exception or dangling in your code first, if you create some memory (texture or assets) in runtime, you must delete that. garbagecollector has dangling and it try to delete that then you will see that message.