NullPointerException upon request completion and session invalidation in EAP 7

Issue

• Upon request completion, we see a NullPointerException:

WARN  [io.undertow.request] (default task-1) null: java.lang.NullPointerException
    at org.wildfly.clustering.web.undertow.session.DistributableSession.requestDone(DistributableSession.java:84)
    at io.undertow.servlet.spec.ServletContextImpl.updateSessionAccessTime(ServletContextImpl.java:768)
    at io.undertow.servlet.spec.HttpServletResponseImpl.responseDone(HttpServletResponseImpl.java:565)
    at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:332)
    at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:264)
    at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81)
    at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:175)
    at io.undertow.server.Connectors.executeRootHandler(Connectors.java:207)
    at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:802)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

• Upon session invalidation, we see a NullPointerException:

Caused by: java.lang.NullPointerException
    at org.wildfly.clustering.web.undertow.session.DistributableSession.invalidate(DistributableSession.java:207)
    at io.undertow.servlet.spec.HttpSessionImpl.invalidate(HttpSessionImpl.java:198)