So the latest verion is in 4.8 and I need a few additional features added in the 4.8 to make it work…
Hi TYRENS-Jonas,
I’ve been looking at your project and have thus far not reproduced any crashes. Can you tell me which blueprint is specifically causing the crash?
BP_DayCycle located in /Common/Sky
Sorry forgot to mentioned that
Any luck with the reproducing?
Hi TYRENS-Jonas,
I was able to reproduce this on my end. However I took this into 4.9 and it is opening again without the crash, so the error that you are experiencing has already been fixed for 4.9.
That’s good and thanks for your time! 
Even though it doesn’t really help me at the moment… I have manage to port the whole blueprint now to 4.8 manually since I really had to make the changes now. But once again I really appriciate your help.