SouceClient is null with vehicles?

This has been driving me crazy so I am appealing to gg community now. I have managed to change out the player.cs to be a vehicle complete with a weapon thanks to LabRat's code. Then I managed to incorperate the vehicleguihealth.cc file and got a working health bar for my vehicle. It took me some time after that but I managed to get weapon fire to take down health and projectiles to collide with the vehicles making the deathmatch aspect work. I even managed to get the vehicle to be destroyed and then spawn a new version.

However this is where I am now stuck. When the player dies by killing themselve's or by another's fire the %1 was killed by %2 always fires no matter what. What I have tracked the problem using echos to send debug info to the console. Basically when trying to get the %sourceClient info the information returned is always null not as in "null" but nothing just blank.

Here is a snippet of my damage and onDamage functions from player.cs

function DefaultCar::damage(%this, %obj, %sourceObject, %position, %damage, %damageType)
{
  
     %amount = %amount+100;
     %obj.applyDamage(%amount); 
     echo("Damage: "@%amount);

     %damage = %obj.getDamageLevel();
     %client = %obj.client;
     %sourceClient = %sourceObject ? %sourceObject.client : 0;
     echo(%sourceObject);
     echo(%sourceClient);


  if (%damage >= %data.destroyedLevel)
   {
      if(%obj.getDamageState() !$= "Destroyed")
         %obj.setDamageState(Destroyed);
         echo ("\n\n***************Player Died***********\n");
         %client.onDeath(%sourceObject, %sourceClient, %damageType, %location);
   }
   else
   {
      if(%obj.getDamageState() !$= "Enabled")
         %obj.setDamageState(Enabled);
   }


}

function DefaultCar::onDamage(%data, %obj, %delta)
{
   
     
 // Increment the flash based on the amount.
      %flash = %obj.getDamageFlash() + ((%delta / %this.maxDamage) * 2);
      if (%flash > 0.75)
         %flash = 0.75;
      %obj.setDamageFlash(%flash);

   
}

And then the onDeath in game.cs

function GameConnection::onDeath(%this, %sourceObject, %sourceClient, %damageType, %damLoc)
{
   // Clear out the name on the corpse
   %this.player.setShapeName("");

   // Switch the client over to the death cam and unhook the player object.
   if (isObject(%this.camera) && isObject(%this.player)) {
      %this.camera.setMode("Corpse",%this.player);
      %this.setControlObject(%this.camera);
   }
   %this.player = 0;

   // Doll out points and display an appropriate message
   if (%damageType $= "Suicide" || %sourceClient == %this) {
      %this.incScore(-1);
      messageAll('MsgClientKilled','%1 takes his own life!',%this.name);
   }
   else {
      %sourceClient.incScore(1);
      messageAll('MsgClientKilled','%1 gets nailed by %2!',%this.name,%sourceClient.name);
      if (%sourceClient.score >= $Game::EndGameScore)
         cycleGame();
   }
}

So that is basically it if my player.cs is defining a character %sourceClient works but if it is a vehicle it returns no value. So any of the master coders out there have any ideas?