[Grim_]

You need to use SetTimerEx to pass the playerid parameter to your countdown callback

pawn Code:

SetTimerEx("countdown", 1000, false, "i", playerid);

Also, just use IsPlayerInRangeOfPoint. I'm sure it's more optimized than the custom function you are using.

pawn Code:

forward countdown(playerid);
public countdown(playerid)
{
    new Float: x, Float: y, Float: z;
    GetPlayerPos(playerid, x, y, z);
    
    for(new i = 0; i < MAX_PLAYERS; i++)
    {
        if(IsPlayerConnected(i) && IsPlayerInRangeOfPoint(i, 200.0, x, y, z))
        {
            // rest of code