Crash on Second Play


My project seems to crash most of the time I play in editor for the second time. So the second time I test it crashes when I hit play. This will always happen when I have changed a blueprint. Everything compiles fine.

I saw others have had this problem. Something about static variables. I have never used them.

Could this be a 4.17 thing or does someone know what this is? Thank you!

Here is my crash report:

Assertion failed: ContainerPtr [File:D:\Build++UE4+Release-4.17+Compile\Sync\Engine\Source\Runtime\CoreUObject\Public\UObject/UnrealType.h] [Line: 324]

UE4Editor_Core!FDebug::AssertFailed() [d:\build++ue4+release-4.17+compile\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:349]
UE4Editor_CoreUObject!UObject::CallFunction() [d:\build++ue4+release-4.17+compile\sync\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:822]