I'm using a WildFly snapshot with Undertow 1.0.0.Alpha19 and Weld 2.0.1.Final. I'm getting the following stacktrace:

16:55:04,534 ERROR [io.undertow.servlet.request] UT015005: Error invoking method requestDestroyed on listener class org.jboss.weld.servlet.WeldListener: java.lang.IllegalStateException: UT000010: Session not found MDEkG_Aum5OlXUsjh11kGkh9
at io.undertow.server.session.InMemorySessionManager$SessionImpl.getAttribute(InMemorySessionManager.java:221) [undertow-core-1.0.0.Alpha19.jar:1.0.0.Alpha19]
at io.undertow.servlet.spec.HttpSessionImpl.getAttribute(HttpSessionImpl.java:106) [undertow-servlet-1.0.0.Alpha19.jar:1.0.0.Alpha19]
at org.jboss.weld.context.http.HttpConversationContextImpl.getSessionAttribute(HttpConversationContextImpl.java:25) [weld-core-impl-2.0.1.Final.jar:2013-06-03 10:29]
at org.jboss.weld.context.http.HttpConversationContextImpl.getSessionAttribute(HttpConversationContextImpl.java:13) [weld-core-impl-2.0.1.Final.jar:2013-06-03 10:29]
at org.jboss.weld.context.AbstractConversationContext.dissociate(AbstractConversationContext.java:161) [weld-core-impl-2.0.1.Final.jar:2013-06-03 10:29]
at org.jboss.weld.servlet.ConversationContextActivator.disassociateConversationContext(ConversationContextActivator.java:162) [weld-core-impl-2.0.1.Final.jar:2013-06-03 10:29]
at org.jboss.weld.servlet.HttpContextLifecycle.requestDestroyed(HttpContextLifecycle.java:159) [weld-core-impl-2.0.1.Final.jar:2013-06-03 10:29]
at org.jboss.weld.servlet.WeldListener.requestDestroyed(WeldListener.java:91) [weld-core-impl-2.0.1.Final.jar:2013-06-03 10:29]
at io.undertow.servlet.core.ApplicationListeners.requestDestroyed(ApplicationListeners.java:196) [undertow-servlet-1.0.0.Alpha19.jar:1.0.0.Alpha19]
at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:159) [undertow-servlet-1.0.0.Alpha19.jar:1.0.0.Alpha19]
at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:114) [undertow-servlet-1.0.0.Alpha19.jar:1.0.0.Alpha19]
at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:47) [undertow-servlet-1.0.0.Alpha19.jar:1.0.0.Alpha19]
at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:90) [undertow-servlet-1.0.0.Alpha19.jar:1.0.0.Alpha19]
at io.undertow.server.HttpHandlers.executeRootHandler(HttpHandlers.java:36) [undertow-core-1.0.0.Alpha19.jar:1.0.0.Alpha19]
at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:607) [undertow-core-1.0.0.Alpha19.jar:1.0.0.Alpha19]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [rt.jar:1.7.0_21]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [rt.jar:1.7.0_21]
at java.lang.Thread.run(Thread.java:722) [rt.jar:1.7.0_21]