Error in server_cleanup

[biokemisten]

hi i got a small error in system>server_cleanup.fsm

Error

Check for hackers
{
if(vehicle _x != _x >
10:39:14  Error position: <Check for hackers
{
if(vehicle _x != _x >
10:39:14  Error Undefined variable in expression: check
10:39:14 Error in expression <_x;

My fragment

      "Check for hackers" \n
      " {" \n
      "      if(vehicle _x != _x && !(vehicle _x in _safety) && (typeOf vehicle _x) != ""ParachuteWest"" && (vehicle _x getVariable [""Sarge"",0] != 1)) then {" \n
      "        diag_log (""CLEANUP: KILLING A HACKER "" + (name _x) + "" "" + str(_x) + "" IN "" + (typeOf vehicle _x));" \n
      "          (vehicle _x) setDamage 1;" \n
      "          _x setDamage 1;" \n
      "    };" \n
      " } forEach allUnits;" \n
      "" \n

Anyone can help me?

-B