Hiscores error

[sajon 0]

i'v been trying to add hiscores but i keep geting this error everytime on logout

[CODE] [5/13/14 1:03 AM]: java.lang.NullPointerException
[5/13/14 1:03 AM]: at server.model.players.Highscores.destroy(Highscores.ja
va:54)
[5/13/14 1:03 AM]: at server.model.players.Highscores.query(Highscores.java
:44)
[5/13/14 1:03 AM]: at server.model.players.Highscores.save(Highscores.java:
66)
[5/13/14 1:03 AM]: at server.model.players.Client.logout(Client.java:1105)
[5/13/14 1:03 AM]: at server.model.players.packets.ClickingButtons.processP
acket(ClickingButtons.java:4448)
[5/13/14 1:03 AM]: at server.model.players.PacketHandler.processPacket(Pack
etHandler.java:141)
[5/13/14 1:03 AM]: at server.model.players.Client.processQueuedPackets(Clie
nt.java:2195)
[5/13/14 1:03 AM]: at server.model.players.PlayerHandler.process(PlayerHand
ler.java:150)
[5/13/14 1:03 AM]: at server.Server.main(Server.java:215)
[5/13/14 1:03 AM]: java.lang.NullPointerException
[5/13/14 1:03 AM]: at server.model.players.Highscores.destroy(Highscores.ja
va:54)
[5/13/14 1:03 AM]: at server.model.players.Highscores.query(Highscores.java
:44)
[5/13/14 1:03 AM]: at server.model.players.Highscores.save(Highscores.java:
67)
[5/13/14 1:03 AM]: at server.model.players.Client.logout(Client.java:1105)
[5/13/14 1:03 AM]: at server.model.players.packets.ClickingButtons.processP
acket(ClickingButtons.java:4448)
[5/13/14 1:03 AM]: at server.model.players.PacketHandler.processPacket(Pack
etHandler.java:141)
[5/13/14 1:03 AM]: at server.model.players.Client.processQueuedPackets(Clie
nt.java:2195)
[5/13/14 1:03 AM]: at server.model.players.PlayerHandler.process(PlayerHand
ler.java:150)
[5/13/14 1:03 AM]: at server.Server.main(Server.java:215)
[/CODE]