Crash during async load

Hello,
has anyone ever encountered such a crash? A few of my players have it and I have no idea what it could be, since I cannot reproduce it and it’s pretty generic code (so not sure which class fails to serialize). My initial thought was that some packages were corrupted, but reinstalling the game doesn’t help. Drivers are up to date, I don’t see anything unusual hooked into the game. It happens during level change.

Game_Win64_Shipping!FField::Construct()[E:\GameSVN\Engine\Engine\Source\Runtime\CoreUObject\Private\UObject\Field.cpp:979]
Game_Win64_Shipping!UStruct::SerializeProperties()[E:\GameSVN\Engine\Engine\Source\Runtime\CoreUObject\Private\UObject\Class.cpp:1759]
Game_Win64_Shipping!UStruct::Serialize()[E:\GameSVN\Engine\Engine\Source\Runtime\CoreUObject\Private\UObject\Class.cpp:1865]
Game_Win64_Shipping!UFunction::Serialize()[E:\GameSVN\Engine\Engine\Source\Runtime\CoreUObject\Private\UObject\Class.cpp:5603]
Game_Win64_Shipping!FAsyncPackage::EventDrivenSerializeExport()[E:\GameSVN\Engine\Engine\Source\Runtime\CoreUObject\Private\Serialization\AsyncLoading.cpp:3215]
Game_Win64_Shipping!FAsyncPackage::ProcessImportsAndExports_Event()[E:\GameSVN\Engine\Engine\Source\Runtime\CoreUObject\Private\Serialization\AsyncLoading.cpp:3545]
Game_Win64_Shipping!<lambda_3f9e63807f07df716a86ae9a89813604>::operator()()[E:\GameSVN\Engine\Engine\Source\Runtime\CoreUObject\Private\Serialization\AsyncLoading.cpp:2307]
Game_Win64_Shipping!FAsyncLoadingThread::ProcessAsyncLoading()[E:\GameSVN\Engine\Engine\Source\Runtime\CoreUObject\Private\Serialization\AsyncLoading.cpp:4071]
Game_Win64_Shipping!FAsyncLoadingThread::TickAsyncThread()[E:\GameSVN\Engine\Engine\Source\Runtime\CoreUObject\Private\Serialization\AsyncLoading.cpp:4856]
Game_Win64_Shipping!FAsyncLoadingThread::Run()[E:\GameSVN\Engine\Engine\Source\Runtime\CoreUObject\Private\Serialization\AsyncLoading.cpp:4783]
Game_Win64_Shipping!FRunnableThreadWin::Run()[E:\GameSVN\Engine\Engine\Source\Runtime\Core\Private\Windows\WindowsRunnableThread.cpp:86]