Interaction System Help

Development Programming & Scripting
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4

Your function CheckForInteractable is hiding the prompt unconditionally, then the trace is showing it again, so those constant calls are normal, you have a bit of a logic issue there.
The logic should be more like this :

void APlayerCharacter::CheckForInteractable()
{
    LineTrace(HitResult, ...);
    AActor* HitActor = HitResult.GetActor();

    // If nothing changed, do nothing
    if (HitActor == CurrentInteractableActor)
        return;

    // Else, we are not looking at the shown actor anymore
    if (CurrentInteractableActor)
    {
        IInterface::Execute_HidePrompt(CurrentInteractableActor);
        CurrentInteractableActor = nullptr;
    }

    // Are we looking at something interactable
    if (HitActor && HitActor->Implements<UInterface>())
    {
        CurrentInteractableActor = HitActor;
        IInterface::Execute_ShowPrompt(CurrentInteractableActor);
    }
}

Regarding the crash, I don’t know, depends on your code.
Are you calling back to Character->Interact from the interactable actor ?
Otherwise, the crash stack trace should help figure out what is looping.