Can't assign slate button pointer to global variable

Development Programming & Scripting UI
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1

Crashes when clicked on created button with LOG error:

LogScript: Warning: Script Msg: No world was found for object (/Engine/Transient.UnrealEdEngine_0:GameInstance_0.PlayerHUD_C_0.Butt_0) passed in to UEngine::GetWorldFromContextObject().

Butt.cpp
void UButt::OnClick()
{
	Cast<AThirdPersCharacter>(UGameplayStatics::GetPlayerPawn(this, 0))->OnClicku(this);
}

void UMyUserWidget::NativeConstruct()
{
	Super::NativeConstruct();
	UniformGridPanel = Cast<UUniformGridPanel>(GetWidgetFromName("UniformGridPanel_0"));
	NewObject<UButt>();
	UniformGridPanel->AddChild(Butt);
}

ThirdPersCharacter.h
UPROPERTY(BlueprintReadWrite)
	UButt* PressedButton;

ThirdPersCharacter.cpp
void AThirdPersCharacter::OnClicku(UButt* ButtRef)
{
	UButt* TempUButt = ButtRef;//no crash
	CurrentButton = ButtRef;//crash

What should i do?