NPE during shutdown

02.02.2012 12:47:43 WARN [org.hippoecm.hst.site.container.HstSiteConfigServlet.destroy():393] Component Manager stopping/closing error
java.lang.NullPointerException
at org.hippoecm.hst.site.container.HstSiteConfigServlet.destroy(HstSiteConfigServlet.java:390)
at org.apache.catalina.core.StandardWrapper.unload(StandardWrapper.java:1436)
at org.apache.catalina.core.StandardWrapper.stop(StandardWrapper.java:1784)
at org.apache.catalina.core.StandardContext.stop(StandardContext.java:4872)
at org.apache.catalina.core.ContainerBase.removeChild(ContainerBase.java:936)
at org.apache.catalina.startup.HostConfig.undeployApps(HostConfig.java:1359)
at org.apache.catalina.startup.HostConfig.stop(HostConfig.java:1330)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:326)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:142)
at org.apache.catalina.core.ContainerBase.stop(ContainerBase.java:1098)
at org.apache.catalina.core.ContainerBase.stop(ContainerBase.java:1110)
at org.apache.catalina.core.StandardEngine.stop(StandardEngine.java:468)
at org.apache.catalina.core.StandardService.stop(StandardService.java:604)
at org.apache.catalina.core.StandardServer.stop(StandardServer.java:788)
at org.apache.catalina.startup.Catalina.stop(Catalina.java:662)
at org.apache.catalina.startup.Catalina.start(Catalina.java:629)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)