Scenario:
1) Log in.
2) Press back button in the browser.
3) Try log in again.

In this case i get an error page and stack trace in the logs:
2009-07-24 19:47:23,953 [SocketListener0-5] ERROR sitemap.handled-errors - The 
continuation ID 317f22597f177110673152108c403769896e0170 is invalid.
        at <map:call> - 
file:///C:/Lenya/build/lenya/webapp/lenya/modules/usecase/usecase.xmap:101:39
        at <map:mount> - 
file:///C:/Lenya/build/lenya/webapp/sitemap.xmap:646:131
org.apache.cocoon.components.flow.InvalidContinuationException: The 
continuation ID 317f22597f177110673152108c403769896e0170 is invalid.
        at <map:call> - 
file:///C:/Lenya/build/lenya/webapp/lenya/modules/usecase/usecase.xmap:101:39
        at <map:mount> - 
file:///C:/Lenya/build/lenya/webapp/sitemap.xmap:646:131
        at 
org.apache.cocoon.components.flow.javascript.fom.FOM_JavaScriptInterpreter.handleContinuation(FOM_JavaScriptInterpreter.java:792)
        at 
org.apache.cocoon.components.treeprocessor.sitemap.CallFunctionNode.invoke(CallFunctionNode.java:124)
        at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:47)
        at 
org.apache.cocoon.components.treeprocessor.sitemap.MatchNode.invoke(MatchNode.java:108)
        at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:69)
        at 
org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(PipelineNode.java:143)
        at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:69)
        at 
org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(PipelinesNode.java:93)
        at 
org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.java:235)
        at 
org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.java:177)
        at 
org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcessor.java:254)
        at 
org.apache.cocoon.components.treeprocessor.sitemap.MountNode.invoke(MountNode.java:118)
        at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:47)
        at 
org.apache.cocoon.components.treeprocessor.sitemap.MatchNode.invoke(MatchNode.java:108)
        at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:69)
        at 
org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(PipelineNode.java:143)
        at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:69)
        at 
org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(PipelinesNode.java:93)
        at 
org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.java:235)
        at 
org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.java:177)
        at 
org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcessor.java:254)
        at org.apache.cocoon.Cocoon.process(Cocoon.java:699)
        at 
org.apache.cocoon.servlet.CocoonServlet.service(CocoonServlet.java:1154)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
        at 
org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:427)
        at 
org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(WebApplicationHandler.java:475)
        at 
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:567)
        at org.mortbay.http.HttpContext.handle(HttpContext.java:1565)
        at 
org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplicationContext.java:635)
        at org.mortbay.http.HttpContext.handle(HttpContext.java:1517)
        at 
org.mortbay.jetty.plus.PlusWebAppContext.handle(PlusWebAppContext.java:158)
        at org.mortbay.http.HttpServer.service(HttpServer.java:954)
        at org.mortbay.http.HttpConnection.service(HttpConnection.java:814)
        at org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:981)
        at org.mortbay.http.HttpConnection.handle(HttpConnection.java:831)
        at 
org.mortbay.http.SocketListener.handleConnection(SocketListener.java:244)
        at org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:357)
        at org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:534)

How to handle this situation? I am thinking about something like expiration 
page. Is this correct?

Best regards,
Oleg Barmin.

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