/test/trend returns an HTTP 500 response instead of an image. This particular job has approx. 535 tests and all are passing.

description The server encountered an internal error () that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: java.lang.NullPointerException
org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:615)
org.kohsuke.stapler.Stapler.invoke(Stapler.java:658)
org.kohsuke.stapler.MetaClass$12.dispatch(MetaClass.java:384)
org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:573)
org.kohsuke.stapler.Stapler.invoke(Stapler.java:658)
org.kohsuke.stapler.MetaClass$6.doDispatch(MetaClass.java:241)
org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:573)
org.kohsuke.stapler.Stapler.invoke(Stapler.java:658)
org.kohsuke.stapler.Stapler.invoke(Stapler.java:487)
org.kohsuke.stapler.Stapler.service(Stapler.java:164)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:95)
hudson.plugins.audit_trail.AuditTrailFilter.doFilter(AuditTrailFilter.java:66)
hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:98)
hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:87)
hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:47)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)
hudson.security.UnwrapSecurityExceptionFilter.doFilter(UnwrapSecurityExceptionFilter.java:51)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
org.acegisecurity.ui.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:124)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
org.acegisecurity.ui.rememberme.RememberMeProcessingFilter.doFilter(RememberMeProcessingFilter.java:142)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:271)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
org.acegisecurity.ui.basicauth.BasicProcessingFilter.doFilter(BasicProcessingFilter.java:174)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
jenkins.security.ApiTokenFilter.doFilter(ApiTokenFilter.java:64)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:249)
hudson.security.HttpSessionContextIntegrationFilter2.doFilter(HttpSessionContextIntegrationFilter2.java:66)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)
hudson.security.HudsonFilter.doFilter(HudsonFilter.java:164)
org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:50)
hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:81)

root cause
java.lang.NullPointerException

note The full stack trace of the root cause is available in the Apache Tomcat/6.0.32 logs.