[AgileWiki] the database just crashed again, but this time I got the traceback

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If we can fix this, then it is time for another release, fer sure! --b

Exception during request procesing: java.util.EmptyStackException null
java.util.EmptyStackException
        at java.util.Stack.peek(Stack.java:79)
        at org.agilewiki.ark.tks.btree.BTree.bImage(BTree.java:644)
        at org.agilewiki.ark.tks.btree.Block._put(Block.java:365)
        at org.agilewiki.ark.tks.btree.Block.put(Block.java:357)
        at org.agilewiki.ark.tks.btree.BTree.put(BTree.java:482)
        at org.agilewiki.ark.tks.TKS.saveTable(TKS.java:389)
        at org.agilewiki.ark.tks.Table.save(Table.java:245)
        at 
org.agilewiki.ark.tks.cache.WriteCache.poolPut(WriteCache.java:77)
        at 
org.agilewiki.ark.tks.cache.WriteCache.poolPut(WriteCache.java:19)
        at org.agilewiki.ark.tks.pool.Poolable.decRef(Poolable.java:64)
        at org.agilewiki.ark.tks.TKS.getKeyValue(TKS.java:584)
        at org.agilewiki.ark.rolons.Rolon.getKeyValue(Rolon.java:250)
        at 
org.agilewiki.ark.rolons.Rolon.getClassifierEntryValue(Rolon.java:1492)
        at org.agilewiki.ark.rolons.Rolon.getName(Rolon.java:470)
        at org.agilewiki.ark.rolons.Rolon.nameEvent(Rolon.java:477)
        at org.agilewiki.ark.rolons.Rolon.nrolonEvent(Rolon.java:401)
        at 
org.agilewiki.ark.rolons.TopicRolon.childrenEvent(TopicRolon.java:195)
        at org.agilewiki.framework.uims.WikiUIM.show(WikiUIM.java:47)
        at 
org.agilewiki.framework.CmdEvaluator.evaluate(CmdEvaluator.java:37)
        at org.agilewiki.framework.Session.evaluate(Session.java:344)
        at org.agilewiki.framework.Session.process(Session.java:504)
        at 
org.agilewiki.framework.Portal.processClientRequest(Portal.java:117)
        at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at 
sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:294)
        at sun.rmi.transport.Transport$1.run(Transport.java:153)
        at java.security.AccessController.doPrivileged(Native Method)
        at sun.rmi.transport.Transport.serviceCall(Transport.java:149)
        at 
sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:460)
        at 
sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:701)
        at java.lang.Thread.run(Thread.java:595)