java.lang.IllegalStateException at [...].AbstractSessionManager trying to stop a plugin

[killyourtv]

 Error 500: /configclients INTERNAL_SERVER_ERROR

java.lang.IllegalStateException
     at org.mortbay.jetty.servlet.AbstractSessionManager$Session.setAttribute(AbstractSessionManager.java:1054)
     at net.i2p.router.web.jsp.configclients_jsp._jspService(configclients_jsp.java:429)
     at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
     at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
     at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:401)
     at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
     at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
     at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)
     at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:450)
     at net.i2p.router.web.LocaleWebAppHandler.handle(LocaleWebAppHandler.java:93)
     at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
     at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
     at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
     at org.mortbay.jetty.Server.handle(Server.java:326)
     at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
     at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:945)
     at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:756)
     at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
     at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
     at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410)
     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
     at java.lang.Thread.run(Thread.java:722)

I2P version: 0.9.4-4-deb1
Java version: Oracle Corporation 1.7.0_03 (OpenJDK Runtime Environment 1.7.0_03-b21)
Wrapper version: 3.5.17
Server version: 6.1.26
Servlet version: Jasper JSP 2.1 Engine
Platform: Linux amd64 3.2.0-4-amd64
Processor: Bulldozer FX-6***/FX-8*** (athlon64)
Jbigi: Locally optimized native BigInteger library loaded from file
Encoding: UTF-8
Charset: UTF-8

I2P rev b73141bfcba08cb78ca9c37cae6e35743d2d98f7

The I2P-Bote plugin was stopped. A few hours later I started it again. A few hours after that I tried to stop it again and I got this error.

[zzz]

new dups #852 and #858. Hopefully fixed in 0.9.4-8. Leaving #852 open for now as the master ticket.