Intermittent osgi webconsole exception on startup

When starting the OSGi Framework with Start Level 2 or higher, the following exception sometimes appears. It seems harmless though...

13:17:02,289 WARN [/] (CM Configuration Updater (ManagedService Update: pid=org.apache.felix.webconsole.internal.servlet.OsgiManager)) org.ops4j.pax.web.service.spi.model.ServletModel-2: unbindHttpService: Failed unregistering Servlet: java.lang.IllegalStateException: ServletModel{id=org.ops4j.pax.web.service.spi.model.ServletModel-2,name=org.ops4j.pax.web.service.spi.model.ServletModel-2,urlPatterns=[/system/console/*],alias=/system/console,servlet=org.apache.felix.webconsole.internal.servlet.OsgiManager@13dc8ea3,initParams={},context=ContextModel{id=org.ops4j.pax.web.service.spi.model.ContextModel-1,name=,httpContext=org.apache.felix.webconsole.internal.servlet.OsgiManagerHttpContext@75187984,contextParams={}}} was not found
at org.ops4j.pax.web.service.jetty.internal.JettyServerImpl.removeServlet(JettyServerImpl.java:230)
at org.ops4j.pax.web.service.jetty.internal.ServerControllerImpl$Started.removeServlet(ServerControllerImpl.java:271)
at org.ops4j.pax.web.service.jetty.internal.ServerControllerImpl.removeServlet(ServerControllerImpl.java:112)
at org.ops4j.pax.web.service.internal.HttpServiceStarted.unregister(HttpServiceStarted.java:205)
at org.ops4j.pax.web.service.internal.HttpServiceProxy.unregister(HttpServiceProxy.java:72)
at org.apache.felix.webconsole.internal.servlet.OsgiManager.unbindHttpService(OsgiManager.java:772) [OsgiManager.class:]
at org.apache.felix.webconsole.internal.servlet.OsgiManager$HttpServiceTracker.removedService(OsgiManager.java:660) [OsgiManager$HttpServiceTracker.class:]
at org.osgi.util.tracker.ServiceTracker$Tracked.untrack(ServiceTracker.java:1126) [ServiceTracker$Tracked.class:]
at org.osgi.util.tracker.ServiceTracker.close(ServiceTracker.java:347) [ServiceTracker.class:]
at org.apache.felix.webconsole.internal.servlet.OsgiManager.updateConfiguration(OsgiManager.java:826) [OsgiManager.class:]
at org.apache.felix.webconsole.internal.servlet.ConfigurationListener.updated(ConfigurationListener.java:66) [ConfigurationListener.class:]
at org.apache.felix.cm.impl.ConfigurationManager$ManagedServiceUpdate.run(ConfigurationManager.java:1160)
at org.apache.felix.cm.impl.UpdateThread.run(UpdateThread.java:104)
at java.lang.Thread.run(Thread.java:680) [:1.6.0_24]