Strangle random error with bots and projectiles

Hi!

I've set up my FPS game with AI Bots using pathfinding (based on the AI Guard resource).
But now i've got a strange random error.

I changed GameConnection::onDeath() to look like this:

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function GameConnection::onDeath(%this, %sourceObject, %sourceClient, %damageType, %damLoc)
{
//reset AmmoAmountHud
%this.setAmmoAmountHud("100");

// 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
{
if(!%sourceClient) // If no source client, chances are it's a bot
{
%bot = %sourceObject.sourceObject;
if(%bot == 0 ) // big problem!! <------ HERE!!!!!!!!!!!!!!!1
{
error("bot = 0 (bot killed player)");
error("sourceObject = " @ %sourceObject);
}

else
%bot.incScore(1);

messageAll('MsgClientKilled','%1 gets nailed by %2!',%this.name,%bot.botname);
if(%bot.score >= $Game::EndGameScore && $Game::EndGameScore)
cycleGame();
}
else
{
%sourceClient.incScore(1);
messageAll('MsgClientKilled','%1 gets nailed by %2!',%this.name,%sourceClient.name);

if(%sourceClient.score >= $Game::EndGameScore && $Game::EndGameScore)
cycleGame();
}
}
}

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look where the HERE comment is. The problem is, that in about 50% of the bot kills, the projectile (%sourceObject) does not include the reference to the bot who shot it.

I think this is REALLY strange, any idea on how to fix it, or where to search for the error? for reference, here is my projectile shooting function

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function m4a1Image::onFire(%this, %obj, %slot)
{
%projectile = %this.projectile;

// Decrement inventory ammo. The image's ammo state is update
// automatically by the ammo inventory hooks.
%obj.decInventory(%this.ammo,1);

%currentAmmo = %obj.getInventory(%this.ammo);
if(%obj.client)
%obj.client.setAmmoAmountHud(%currentAmmo);

// Determin initial projectile velocity based on the
// gun's muzzle point and the object's current velocity
%muzzleVector = %obj.getMuzzleVector(%slot);
%objectVelocity = %obj.getVelocity();
%muzzleVelocity = VectorAdd(
VectorScale(%muzzleVector, %projectile.muzzleVelocity),
VectorScale(%objectVelocity, %projectile.velInheritFactor));

// Create the projectile object
%p = new (%this.projectileType)() {
dataBlock = %projectile;
initialVelocity = %muzzleVelocity;
initialPosition = %obj.getMuzzlePoint(%slot);
sourceObject = %obj;
sourceSlot = %slot;
client = %obj.client;
};
MissionCleanup.add(%p);
return %p;
}

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Could the problem maybe have to do with my projectiles have no shape, but only beeing particles?