神武重置人物属性点:为什么bokee博客不能修改资料？

一点修改资料就弹出一个网页，写着如下内容：
HTTP Status 500 -

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type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

java.lang.NumberFormatException: null
java.lang.Integer.parseInt(Integer.java:436)
java.lang.Integer.parseInt(Integer.java:518)
com.bokee.userinfo.dao.ice.IceUserDAO.findByID(IceUserDAO.java:340)
com.bokee.userinfo.service.pojo.POJOUserService.queryUser(POJOUserService.java:105)
com.bokee.userinfo.util.UserInfoHandler.matchingDistrict(UserInfoHandler.java:84)
com.bokee.userinfo.interceptor.UserAuthenticateInterceptor.intercept(UserAuthenticateInterceptor.java:33)
com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:164)
com.opensymphony.xwork.DefaultActionProxy.execute(DefaultActionProxy.java:116)
com.opensymphony.webwork.dispatcher.ServletDispatcher.serviceAction(ServletDispatcher.java:272)
com.opensymphony.webwork.dispatcher.ServletDispatcher.service(ServletDispatcher.java:237)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
com.bokee.userinfo.util.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:57)

note The full stack trace of the root cause is available in the Apache Tomcat/5.0.27 logs.

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Apache Tomcat/5.0.27
怎么回事？请大侠指点！