AttachRootComponentToActor crashes multiplayer game

Development Character & Animation
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2

I narrowed it down a little bit by writing a function in my pickup-class. The “AttachRootComponentTo”-Function inside this function is causing the crash.

void ASomPickup::AttachToCompSocket(USceneComponent* Comp, FName Socket)
{
	//Disable Physics
	this->EnvironmentMeshComponent->SetSimulatePhysics(false);

	//Disable Collision
	this->EnvironmentMeshComponent->SetCollisionEnabled(ECollisionEnabled::NoCollision);

	//Attach Pickup to Socket
	this->AttachRootComponentTo(Comp, Socket, EAttachLocation::SnapToTarget);
}

As I said. In singleplayer it works fine. In multiplayer the game crashes. Does anybody have a suggestion?