500 error when trying to approve a change request

Create a change request, submit for approval, click the link, 500 error. Build 7011, we tried it on 7009 and it just didn't do anything(no 500 error tho).

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.NullPointerException
org.apache.jsp.approval.Approve_jsp._jspService(Approve_jsp.java:353)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
com.adventnet.servicedesk.filter.EncodingFilter.doFilter(EncodingFilter.java:92)
com.adventnet.authentication.ContextChangeDetector.doFilter(ContextChangeDetector.java:100)
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.
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Apache Tomcat/5.0.28