Strange error in the log

[Onepamopa]

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I started to get this message recently, I just noticed it in the logs, so here it is:
Anyone knows what's this error, and how to fix it ?

could not restore container:
java.lang.NullPointerException
at com.l2jserver.gameserver.model.ClanWarehouse.getOwner(ClanWarehouse.java:38)
at com.l2jserver.gameserver.model.ClanWarehouse.getOwner(ClanWarehouse.java:22)
at com.l2jserver.gameserver.model.itemcontainer.ItemContainer.restore(ItemContainer.java:633)
at com.l2jserver.gameserver.model.L2Clan.<init>(L2Clan.java:184)
at com.l2jserver.gameserver.datatables.ClanTable.<init>(ClanTable.java:93)
at com.l2jserver.gameserver.datatables.ClanTable.<init>(ClanTable.java:56)
at com.l2jserver.gameserver.datatables.ClanTable$SingletonHolder.<clinit>(ClanTable.java:528)
at com.l2jserver.gameserver.datatables.ClanTable.getInstance(ClanTable.java:64)
at com.l2jserver.gameserver.GameServer.<init>(GameServer.java:250)
at com.l2jserver.gameserver.GameServer.main(GameServer.java:502)

I thought that this is related to clanhalls, so I checked clanhall.sql @ our server, ownerId is 0 on all clan halls.
There are clans with clan halls @ the server.
Still cant find anything about this error

[jurchiks]

warehouse has nothing to do with clan hall...

[hope]

warehouse has nothing to do with clan hall...

it does it takes the adena from the clan wh to pay for the clan hall

[Onepamopa]

well, I still get this error and I dont know what to do.
No one of the developers even responded in the topic with some info..

[Onepamopa]

_DS_ said a while ago that this is caused by:
"You have a clan without leader in the table. "
This isnt the case, cause I checked the clan_data table - every clan has leader.

[Onepamopa]

Here's more complete log:

L2World: Setting up World Regions
L2World: (136 by 136) World Region Grid set up.
could not restore container:
java.lang.NullPointerException
at com.l2jserver.gameserver.model.ClanWarehouse.getOwner(ClanWarehouse.java:38)
at com.l2jserver.gameserver.model.ClanWarehouse.getOwner(ClanWarehouse.java:22)
at com.l2jserver.gameserver.model.itemcontainer.ItemContainer.restore(ItemContainer.java:633)
at com.l2jserver.gameserver.model.L2Clan.<init>(L2Clan.java:184)
at com.l2jserver.gameserver.datatables.ClanTable.<init>(ClanTable.java:93)
at com.l2jserver.gameserver.datatables.ClanTable.<init>(ClanTable.java:56)
at com.l2jserver.gameserver.datatables.ClanTable$SingletonHolder.<clinit>(ClanTable.java:528)
at com.l2jserver.gameserver.datatables.ClanTable.getInstance(ClanTable.java:64)
at com.l2jserver.gameserver.instancemanager.ClanHallManager.load(ClanHallManager.java:105)
at com.l2jserver.gameserver.instancemanager.ClanHallManager.<init>(ClanHallManager.java:61)
at com.l2jserver.gameserver.instancemanager.ClanHallManager.<init>(ClanHallManager.java:36)
at com.l2jserver.gameserver.instancemanager.ClanHallManager$SingletonHolder.<clinit>(ClanHallManager.java:249)
at com.l2jserver.gameserver.instancemanager.ClanHallManager.getInstance(ClanHallManager.java:47)
at com.l2jserver.gameserver.GameServer.<init>(GameServer.java:214)
at com.l2jserver.gameserver.GameServer.main(GameServer.java:502)

Restored 47 clans from the database.
Loaded: 3 clan halls
Loaded: 41 free clan halls