Blueprint UI OnClick not in game thread as C++ Tick

Development Programming & Scripting C++
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1

Hi, I have a function that is invoked by UI click, which modifies a TArray, and in Tick, it does that too.

Pseduo code

TArray <UUserWidget *>   pool;
TArray <UUserWidget *>   active;

UFUNCTION (BlueprintCallable)
void FunctionFromUIClick ()
{
    if (! pool.IsEmpty ())  
	{
	    UUserWidget *> u = pool.Pop ();
		active.Add ();
	}
}

void Tick (float deltaTime) override
{
    TArray <UUserWidget *> temp;
	
		
	for (UUserWidget * u: active)
	   if (! u.IsInViewport ())
	      temp.Add (u)
	
	for (UUserWidget * t : temp)
	{
		active.Remove (t);
		pool.Add (t);
	}
}

Sometime, it will crash when I spam click FunctionFromUIClick from blueprint. It seems like a race condition, the blueprint Click is not in same game thread as Tick?