Null exception

[FG28_Kodiak]

Why so complicated

 private void damageAiControlledPlane(AiActor actorMain)
    {
        if (actorMain != null && actorMain is AiAircraft)
            if (isAiControlledPlane(actorMain as AiAircraft))
                    (actorMain as AiAircraft).Destroy();
    }