[Konstantinos]

Is ServerHeartbeatTwo a timer from y_timers? Anyways, let's say you pass a playerid in an array. Check if the playerid is valid first, because it passes 65535 (INVALID_PLAYER_ID) when the max is MAX_PLAYERS (0-499).

It's better to show us that public in order to explain you better and fix it. I can't guess what your code would be.