How much life is left?

I'm writing an AutoAttack function and I need to determine how much life is left in my player, so if he's really getting wailed on he can stop the attack.

function ServerCmdAutoAttack(%client){
	if(!%client.getSelectedObject()){
		MessageClient(%client,'No target','You have no target to attack!');
		%client.Player.AttackOn = 0;
	}else{
		%targetObject = %client.getSelectedObject();
		while(%targetObject.Damage > 0 && %client.Damage >0 && %client.Player.AttackOn == 1){
			AttackRoll(%client,%targetObject);
		}
		
	}
 }

The above function is exhibiting fall through behavior, which I am attributing to the fact that %client.Damage or %targetObject.Damage is not returning anything or possibly returning 0.

This is making me nuts, can anyone please show me whats wrong here?