My server log now shows this. What could it be?
2022-12-30 15:56:38 WARN: /api/socket - Cannot invoke "java.lang.Long.longValue()" because the return value of "javax.servlet.http.HttpSession.getAttribute(String)" is null - NullPointerException (AsyncSocketServlet:54 < ...)
Web app trying to connect with an expired or old session.
My server log now shows this. What could it be?