Hudson 1.284, Claim 1.3. I had claimed a broken build. My colleague attempted to
claim it instead of me. But his attempt ended in error:

java.lang.Error: This page expects a form submission
org.kohsuke.stapler.RequestImpl.getSubmittedForm(RequestImpl.java:659)
hudson.plugins.claim.ClaimBuildAction.doClaim(ClaimBuildAction.java:50)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:156)
org.kohsuke.stapler.Function.bindAndInvoke(Function.java:76)
org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:73)
org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:30)
org.kohsuke.stapler.Stapler.invoke(Stapler.java:438)
org.kohsuke.stapler.MetaClass$12.dispatch(MetaClass.java:313)
org.kohsuke.stapler.Stapler.invoke(Stapler.java:438)
org.kohsuke.stapler.MetaClass$12.dispatch(MetaClass.java:313)
org.kohsuke.stapler.Stapler.invoke(Stapler.java:438)
org.kohsuke.stapler.MetaClass$6.doDispatch(MetaClass.java:181)
org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:30)
org.kohsuke.stapler.Stapler.invoke(Stapler.java:438)
org.kohsuke.stapler.Stapler.invoke(Stapler.java:356)
org.kohsuke.stapler.Stapler.service(Stapler.java:116)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:91)
hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:83)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:75)
hudson.plugins.audit_trail.AuditTrailFilter.doFilter(AuditTrailFilter.java:35)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:78)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:75)
hudson.security.UnwrapSecurityExceptionFilter.doFilter(UnwrapSecurityExceptionFilter.java:51)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:78)
org.acegisecurity.ui.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:166)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:78)
org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:78)
org.acegisecurity.ui.rememberme.RememberMeProcessingFilter.doFilter(RememberMeProcessingFilter.java:142)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:78)
org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:271)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:78)
org.acegisecurity.ui.basicauth.BasicProcessingFilter.doFilter(BasicProcessingFilter.java:173)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:78)
org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:249)
hudson.security.HttpSessionContextIntegrationFilter2.doFilter(HttpSessionContextIntegrationFilter2.java:65)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:78)
hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:67)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:78)
hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:67)
hudson.security.HudsonFilter.doFilter(HudsonFilter.java:133)