L2J Server

L2J Revision 5235:
L2JDP Revision 8755:
Hi
can someone explain to me why this error?
Does not come out right away but after a few hours !!
Repeating the same mistake, while the server continues to run.

Exception in thread "GeneralSTPool-7" java.lang.NullPointerException?
at com.l2jserver.gameserver.model.entity.ClanHall?.banishForeigners(ClanH
all.java:413)

Tnx.

null pointer exception appears when u are trying to do something with variable that is null, show what u have got in ClanHall class at line:413