Hack - 2 Questions :3

Hey guys

Im not sure this is the correct forum but I have 2 questions regarding warrock hacks:

1) When I log off server or exit game with my hack, the game crashes:S My question is Why is it happening and how can I prevent it?

2) I cant get the boolean working correctly:

What I intend to do is that when I press 8:
If nospread is active, deactivate it
if Nospread is not active, activate it

Note: I declared: bool Nosp = false;
[php]void NoSpread()
{
if(Nosp==true)
{
*(float*) ADR_NOSPREAD = 0;
}
else
{
*(float*) ADR_NOSPREAD = 1;
}

}

void KeyCheck()
{
if(GetAsyncKeyState(VK_NUMPAD8)&1)
{
if(Nosp==true)
{
Nosp=false;
}
else
{
Nosp=true;
}
}
}[/php]

Thanks in advance