Bugs Error Help!

[HypeRawrz]

This is what happened i loaded a map and the the next thing i know this bug keeps on popping up!
---26/05/2013 14:22:46 ----
Type: NullReferenceException
Source: MCDzienny_
Message: Object reference not set to an instance of an object.
Target: <PlayerLocationCheck>b__25
Trace: at MCDzienny.Server.<PlayerLocationCheck>b__25(Player p)
Thanks for yout time,
Hype!

[dzienny]

I guess you were changing the game modes from Lava->Zombie or something else. Anyway, I think you have to restart the server and the error should not appear again. Changing game modes may cause some errors unless the server is restarted. But then it should work fine with a new game mode.

[HypeRawrz]

Thanks