java.lang.NullPointerException

java.lang.NullPointerException
	at glog.webserver.util.Util.isWapUser(Util.java:2296)
	at glog.webserver.servlet.umt.Login.getXSL(Login.java:326)
	at glog.webserver.util.BaseServlet.getServletResult(BaseServlet.java:269)
	at glog.webserver.util.BaseServlet.getServletResultEx(BaseServlet.java:705)
	at glog.webserver.servlet.DefaultServlet.getServletResultEx(DefaultServlet.java:157)
	at glog.webserver.util.BaseServlet.process(BaseServlet.java:444)
	at glog.webserver.util.BaseServlet.service(BaseServlet.java:652)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
	at glog.webserver.screenlayout.ClientSessionTracker.doFilter(ClientSessionTracker.java:59)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
	at com.dhl.sci.ssosecurity.SSORestrictionFilter.doFilter(SSORestrictionFilter.java:49)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
	at glog.webserver.util.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:44)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
	at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:199)
	at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:282)
	at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:754)
	at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:684)
	at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:876)
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
	at java.lang.Thread.run(Thread.java:534)