blueprinted class, get set or call crashes editor

void AAnimationTestCharacter::Fire()
{
    /* OPTION ONE - FOR LOOP - This is much faster way (to write)*/
    for (int i = 0; i < WeaponsArray.Num(); i++) {
        UE_LOG(LogTemp, Log, TEXT("SHOOTING"));

        WeaponsArray[i]->SetIsFiring(true); //<-- Here error occurs
    }

    AAnimationTestCharacter::PlayShootAnimation();
}