This is present in both F23 and rawhide, since both are on fop 2.0. F22 and earlier is not affected. Upstream bug: https://issues.apache.org/jira/browse/FOP-2461 I can consistently reproduce the crash when building the docs for erlang. I've scratch built fop for rawhide, including the upstream patch on trunk which fixes the NullPointerException (http://svn.apache.org/viewvc?view=revision&revision=1690396) and can verify that it fixes the issue when building the erlang documentation. http://koji.fedoraproject.org/koji/taskinfo?taskID=10623582 Please include this patch for rawhide and F23.
fop-2.0-2.fc23 has been submitted as an update for Fedora 23. https://admin.fedoraproject.org/updates/fop-2.0-2.fc23
Package fop-2.0-2.fc23: * should fix your issue, * was pushed to the Fedora 23 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing fop-2.0-2.fc23' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2015-13046/fop-2.0-2.fc23 then log in and leave karma (feedback).
fop-2.0-2.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.