Internal Server Error in jira/secure/ViewProfile.jspa : javax.servlet.jsp.JspTagException: groups is null

When I try to view the profile of a user from a variety of places (noticed in "browse project" and "administration") I get:

javax.servlet.jsp.JspTagException: groups is null
at webwork.view.taglib.IteratorTag.doStartTag(IteratorTag.java:72)
at /secure/views/viewprofile.jsp._jspService(/secure/views/viewprofile.jsp.java:354) (JSP page line 34)
at com.orionserver[Orion/1.5.4 (build 10585)].http.OrionHttpJspPage.service(.:56)
at com.evermind[Orion/1.5.4 (build 10585)]._cp._vhc(.:5639)
at com.evermind[Orion/1.5.4 (build 10585)].server.http.JSPServlet.service(.:31)
at com.evermind[Orion/1.5.4 (build 10585)]._ie.doFilter(.:59)
at com.atlassian.jira.web.security.SecurityFilter.doFilter(SecurityFilter.java:92)
at com.evermind[Orion/1.5.4 (build 10585)]._ic.doFilter(.:16)
at com.atlassian.jira.web.security.LoginFilter.doFilter(LoginFilter.java:102)
at com.evermind[Orion/1.5.4 (build 10585)]._ic.doFilter(.:20)
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)]._deb.forward(.:141)
at webwork.dispatcher.ServletDispatcher.service(ServletDispatcher.java:266)
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)

Also, here is some debug output from Orion:

DEBUG [(webwork.dispatcher.ServletDispatcher)] Action:ViewProfile
DEBUG [(action.user.ViewProfile)] Action executing..
DEBUG [(action.user.ViewProfile)] Action execution done
DEBUG [(action.user.ViewProfile)] Action executed in 0 ms
DEBUG [(webwork.dispatcher.ServletDispatcher)] Result:success
DEBUG [(webwork.dispatcher.ServletDispatcher)] View:/secure/views/viewprofile.jsp
DEBUG [(view.taglib.ActionTag)] Action:util.ConfigAction
DEBUG [(action.util.ConfigAction)] Action executing..
DEBUG [(action.util.ConfigAction)] Action execution done
DEBUG [(action.util.ConfigAction)] Action executed in 0 ms
DEBUG [(view.taglib.ActionTag)] Result:success
DEBUG [(provider.ofbiz.OFBizProfileProvider)] user jhow not found
DEBUG [(provider.ofbiz.OFBizProfileProvider)] user jhow not found
DEBUG [(provider.ofbiz.OFBizProfileProvider)] user jhow not found
DEBUG [(provider.ofbiz.OFBizProfileProvider)] user jhow not found
DEBUG [(provider.ofbiz.OFBizProfileProvider)] user jhow not found
DEBUG [(provider.ofbiz.OFBizProfileProvider)] user jhow not found
DEBUG [(provider.ofbiz.OFBizProfileProvider)] user jhow not found
DEBUG [(provider.ofbiz.OFBizProfileProvider)] user jhow not found
DEBUG [(provider.ofbiz.OFBizProfileProvider)] user jhow not found
DEBUG [(provider.ofbiz.OFBizProfileProvider)] user jhow not found
DEBUG [(provider.ofbiz.OFBizAccessProvider)] user jhow not found
null
DEBUG [(provider.ofbiz.OFBizAccessProvider)] user jhow not found