Internal server error from presence messages

After some time  (minutes to hours) the java process is using 1 of 2 cpu's completely, then 2 of 2 and stops servicing. About this time I get in the error log (openfire_2015-03-23.deb):

2015.03.24 17:33:30 org.jivesoftware.openfire.nio.NIOConnection - Failed to deliver packet: <presence to="someone@domain.de/PC_Pidgin" from="talk@co

nference.domain.de/someone" type="unavailable"><priority>1</priority><c xmlns="http://jabber.org/protocol/caps" node="http://pidgin.im/" hash="sha-1" ver=

"AcN1/PEN8nq7AHD+9jpxMV4U6YM=" ext="voice-v1 camera-v1 video-v1"/><x xmlns="vcard-temp:x:update"><photo>56ae7e2105c682afccb6922cff2d497fd5dc2260</ph oto

></x><x xmlns="http://jabber.org/protocol/muc#user"><item jid="someone@domain.de/PC_Pidgin" affiliation="owner" role="none"/><status code="110"/><

/x></presence>

2015.03.24 17:33:30 org.jivesoftware.openfire.session.LocalSession - Internal server error

java.lang.IllegalStateException: Connection closed

        at org.jivesoftware.openfire.nio.NIOConnection.deliver(NIOConnection.java:264)

        at org.jivesoftware.openfire.session.LocalClientSession.deliver(LocalClientSession .java:857)

        at org.jivesoftware.openfire.session.LocalSession.process(LocalSession.java:289)

        at org.jivesoftware.openfire.spi.RoutingTableImpl.routeToLocalDomain(RoutingTableI mpl.java:354)

        at org.jivesoftware.openfire.spi.RoutingTableImpl.routePacket(RoutingTableImpl.jav a:239)

        at org.jivesoftware.openfire.PresenceRouter.handle(PresenceRouter.java:170)

        at org.jivesoftware.openfire.PresenceRouter.route(PresenceRouter.java:84)

        at org.jivesoftware.openfire.spi.PacketRouterImpl.route(PacketRouterImpl.java:84)

        at org.jivesoftware.openfire.spi.PacketRouterImpl.route(PacketRouterImpl.java:65)

        at org.jivesoftware.openfire.muc.spi.LocalMUCRole.send(LocalMUCRole.java:266)

        at org.jivesoftware.openfire.muc.spi.LocalMUCRoom.broadcast(LocalMUCRoom.java:1153 )

        at org.jivesoftware.openfire.muc.cluster.BroadcastPresenceRequest$1.run(BroadcastP resenceRequest.java:71)

        at org.jivesoftware.openfire.muc.cluster.MUCRoomTask.execute(MUCRoomTask.java:85)

        at org.jivesoftware.openfire.muc.cluster.BroadcastPresenceRequest.run(BroadcastPre senceRequest.java:69)

        at org.jivesoftware.openfire.muc.spi.LocalMUCRoom.broadcastPresence(LocalMUCRoom.j ava:1106)

        at org.jivesoftware.openfire.muc.spi.LocalMUCRoom.leaveRoom(LocalMUCRoom.java:826)

        at org.jivesoftware.openfire.muc.spi.LocalMUCUser.process(LocalMUCUser.java:552)

        at org.jivesoftware.openfire.muc.spi.LocalMUCUser.process(LocalMUCUser.java:197)

        at org.jivesoftware.openfire.muc.spi.MultiUserChatServiceImpl.processPacket(MultiU serChatServiceImpl.java:324)

        at org.jivesoftware.openfire.component.InternalComponentManager$RoutableComponents .process(InternalComponentManager.java:591)

        at org.jivesoftware.openfire.spi.RoutingTableImpl.routeToComponent(RoutingTableImp l.java:401)

        at org.jivesoftware.openfire.spi.RoutingTableImpl.routePacket(RoutingTableImpl.jav a:243)

        at org.jivesoftware.openfire.PresenceRouter.handle(PresenceRouter.java:170)

        at org.jivesoftware.openfire.PresenceRouter.route(PresenceRouter.java:84)

        at org.jivesoftware.openfire.handler.PresenceUpdateHandler.broadcastUnavailableFor DirectedPresences(PresenceUpdateHandler.java:489)

        at org.jivesoftware.openfire.handler.PresenceUpdateHandler.process(PresenceUpdateH andler.java:163)

        at org.jivesoftware.openfire.handler.PresenceUpdateHandler.process(PresenceUpdateH andler.java:137)

        at org.jivesoftware.openfire.handler.PresenceUpdateHandler.process(PresenceUpdateH andler.java:201)

        at org.jivesoftware.openfire.PresenceRouter.handle(PresenceRouter.java:148)

        at org.jivesoftware.openfire.PresenceRouter.route(PresenceRouter.java:84)

        at org.jivesoftware.openfire.spi.PacketRouterImpl.route(PacketRouterImpl.java:84)

        at org.jivesoftware.openfire.SessionManager$ClientSessionListener.onConnectionClos e(SessionManager.java:1242)

        at org.jivesoftware.openfire.nio.NIOConnection.notifyCloseListeners(NIOConnection. java:240)

        at org.jivesoftware.openfire.nio.NIOConnection.close(NIOConnection.java:222)

        at org.jivesoftware.openfire.nio.NIOConnection.systemShutdown(NIOConnection.java:2 30)

        at org.jivesoftware.openfire.spi.LocalRoutingTable.stop(LocalRoutingTable.java:146 )