Refreshing EditUser.jspa - NPE

com.opensymphony.module.user.EntityNotFoundException: No user null found
at com.opensymphony.module.user.UserManager.getEntity(UserManager.java:284)
at com.opensymphony.module.user.UserManager.getUser(UserManager.java:111)
at com.atlassian.jira.user.UserUtils.getUser(UserUtils.java:33)
at com.atlassian.jira.web.action.user.EditUser.doExecute(EditUser.java:27)
at webwork.action.ActionSupport.execute(ActionSupport.java:87)
at webwork.dispatcher.ServletDispatcher.service(ServletDispatcher.java:184)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:336)
at com.evermind[Orion/1.5.4 (build 10585)]._ie.doFilter(.:59)
at com.atlassian.jira.web.security.SecurityFilter.doFilter(SecurityFilter.java:144)
at com.evermind[Orion/1.5.4 (build 10585)]._ic.doFilter(.:16)
at com.atlassian.jira.web.security.LoginFilter.doFilter(LoginFilter.java:160)
at com.evermind[Orion/1.5.4 (build 10585)]._ic.doFilter(.:20)
at com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(Unknown Source)
at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(Unknown Source)
at com.evermind[Orion/1.5.4 (build 10585)]._deb._lnc(.:376)
at com.evermind[Orion/1.5.4 (build 10585)]._deb._wmb(.:170)
at com.evermind[Orion/1.5.4 (build 10585)]._co._wbb(.:581)
at com.evermind[Orion/1.5.4 (build 10585)]._co._fs(.:189)
at com.evermind[Orion/1.5.4 (build 10585)]._bt.run(.:62)