How to get value from another class member?

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I tried like this but the engine crash when I try to access the member value in UE_LOG line

TriggerComponent.h

public:

	UTriggerComponent();
	
	UGrabber* Grabber;

TriggerComponent.cpp

void UTriggerComponent::TickComponent(float DeltaTime, ELevelTick TickType,
	FActorComponentTickFunction* ThisTickFunction)
{
	Super::TickComponent(DeltaTime, TickType, ThisTickFunction);

	AActor* Actor = GetAcceptedActor();
	if (Actor == nullptr) return;
	Grabber = Actor->FindComponentByClass<UGrabber>();

       UE_LOG(LogTemp, Warning, TEXT("grab key %s"),(Grabber->GrabKeyOn ? TEXT("grab on") : TEXT("grab off")));   //engine crash here