"IllegalStateException: Context is already active" when error-page of exception-type com.sun.faces.context.FacesFileNotFoundException

Weld throws an exception of "IllegalStateException: Context is already active" when attempting to access a facelets page that doesn't exist (one that matches the url-pattern for the FacesServlet).

Attached is a minimal war (contains no class files) which exhibits this error.

The web application works if the "WEB-INF/beans.xml" file is removed (not a solution for an application using Weld).

Simplified stack trace is:

[#|2011-03-31T20:16:28.406+1000|WARNING|glassfish3.1|javax.enterprise.system.container.web.com.sun.enterprise.web|_ThreadID=169;_ThreadName=Thread-2;|org.apache.catalina.core.StandardHostValve@1042d3b: Exception Processing ErrorPage[exceptionType=com.sun.faces.context.FacesFileNotFoundException, location=/notFound.xhtml]
javax.servlet.ServletException: Context is already active
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:422)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1534)
...
Caused by: java.lang.IllegalStateException: Context is already active
at org.jboss.weld.context.AbstractConversationContext.activate(AbstractConversationContext.java:301)
at org.jboss.weld.jsf.WeldPhaseListener.activateConversations(WeldPhaseListener.java:110)
at org.jboss.weld.jsf.WeldPhaseListener.beforePhase(WeldPhaseListener.java:84)
at com.sun.faces.lifecycle.Phase.handleBeforePhase(Phase.java:228)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:99)
at com.sun.faces.lifecycle.RestoreViewPhase.doPhase(RestoreViewPhase.java:113)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:409)
... 27 more