Calling setAttribute(key, value) on Session with a 'null ' value leads to a NullPointerException

java.lang.NullPointerException
java.util.concurrent.ConcurrentHashMap.putVal(ConcurrentHashMap.java:1011)
java.util.concurrent.ConcurrentHashMap.put(ConcurrentHashMap.java:1006)
io.undertow.server.session.InMemorySessionManager$SessionImpl.setAttribute(InMemorySessionManager.java:484)
org.wildfly.elytron.web.undertow.server.ElytronHttpExchange$2.setAttachment(ElytronHttpExchange.java:380)