To add a little more info, the relevant part of the call stack: UE4Editor-CoreUObject.dll!UMapProperty::NetSerializeItem(FArchive & Ar, UPacka - Pastebin.com
To add a little more info, the relevant part of the call stack: UE4Editor-CoreUObject.dll!UMapProperty::NetSerializeItem(FArchive & Ar, UPacka - Pastebin.com