HTTP Status 500 when completing survey

HTTP Status 500 when completing survey

Hi all.
 
When users try to complete a survey on ServiceDesk+ Enterprise (version 7.6.0 build 7606) they receive the following error:
 

HTTP Status 500 -


type Exception report

message

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

exception

java.lang.NullPointerException

        org.apache.jsp.survey.SurveyDetails_jsp._jspService(SurveyDetails_jsp.java:190)

        org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)

        javax.servlet.http.HttpServlet.service(HttpServlet.java:810)

        org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1069)

        org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:455)

        org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:279)

        org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)

        org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)

        javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

        javax.servlet.http.HttpServlet.service(HttpServlet.java:810)

        com.adventnet.servicedesk.filter.EncodingFilter.doFilter(EncodingFilter.java:109)

        org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:75)

note The full stack trace of the root cause is available in the Apache Tomcat/5.0.28 logs.


Apache Tomcat/5.0.28

 
Any suggestions for fixing this would be welcome.  Strangely, it works for technicians but not requesters.
 
Thanks,
Dave

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