[Mean]

Because OnPlayerDisconnect can't be called when player time outs. You need to make a timer to save all players stats.

pawn Код:

// GameModeInit
SetTimer( "SaveStats", 120000, 1 ); // Saves all stats every 2 minutes.

Later in script

pawn Код:

forward SaveStats( );
public SaveStats( )
{
    for( new playerid = 0; playerid < MAX_PLAYERS; playerid++ ) if( IsPlayerConnected( playerid ) && !IsPlayerNPC( playerid ) )
    {
        // Your save code, from OnPlayerDisconnect goes here
    }
    return 1;
}

Also, make sure you include a_npc,

pawn Код:

#include < a_npc >

You need it because the loop I made works like foreach, it excludes NPCs and skips non-connected players.