How can I delete this fire?

[Icaruk 14]

I created this:

fire = "test_EmptyObjectForFireBig" createVehicle (getMarkerPos "origin");

I delete with this:

{if (typeOf _x == "#particlesource") then {deleteVehicle _x}} forEach (player nearObjects 5);

But with this propagation script:

while {true} do {



if (isNull fire) then {
	hint "Fire has been ended";
};

if !(isNull fire) then {
	{fire = "test_EmptyObjectForFireBig" createVehicle (getPos _x);} forEach ((getPos fire) nearObjects ["House",25]);
	hint "Fire propagated";
};

sleep 20;
};

It seems that fire is never null, because it keeps propagating itself, it doesn't matter if I delete the first fire, it remain still "something" that propagates the fire.