FTimerHandle causes Widget to not load

Development Programming & Scripting UI
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1

I found a weird behavior that I am trying to understand. The following code causes my widget which is set in the blueprint and used in c++ to be null:

    FTimerHandle UITimer;

/** The widget class we will use as our menu when the game starts. */
UPROPERTY(EditAnywhere, BlueprintReadOnly, Category = "UMG Game")
	TSubclassOf<UUserWidget> StartingWidgetClass;

/** The widget instance that we are using as our menu. */
UPROPERTY()
	UUserWidget* CurrentWidget;

But this one works, only by declaring a timer below. Is it a bug? Or why does it happen?

/** The widget class we will use as our menu when the game starts. */
UPROPERTY(EditAnywhere, BlueprintReadOnly, Category = "UMG Game")
	TSubclassOf<UUserWidget> StartingWidgetClass;

/** The widget instance that we are using as our menu. */
UPROPERTY()
	UUserWidget* CurrentWidget;

FTimerHandle UITimer;