[MBilal]

Can you find it Press Crtl+F and find WT where you define it
is it timer or some thing else?

because in this code

public OnGameModeExit()
{
new WT; //you defining variable here and its not timer
KillTimer(ClockTimer);
KillTimer(WT); // you killing variable which is not timer
db_close(Database);
return 1;
}