[nilanjay]

pawn Код:

if(killerid != INVALID_PLAYER_ID)
    {
        SetPlayerScore(killerid, GetPlayerScore(killerid) + 1);
    }

This above code of your says that if the killerid is invalid then add +1 to the score of killerid. That's why it is not working.

Try this

pawn Код:

if(killerid != INVALID_PLAYER_ID)
else
    {
        SetPlayerScore(killerid, GetPlayerScore(killerid) + 1);
    }
SetPVarInt(playerid, "Dead", 1);
    SendDeathMessage(killerid, playerid, reason); // Shows the kill in the killfeed
return 1;
}