[ReVo_]

stock SetPlayerPosEx(playerid, Float: fX, Float: fY, Float: fZ)
{
printf("a");
stopChecking[playerid] = true;

acPos[playerid][0] = fX;
acPos[playerid][1] = fY;
acPos[playerid][2] = fZ;

SetPlayerPos(playerid, fX, fY, fZ);

stopChecking[playerid] = false;
return true;
}

#define SetPlayerPos SetPlayerPosEx

In top of your script ;/