Last modified: 2014-07-14 18:16:47 UTC
What's going on is that EditPage is trying to check for the submitted user and edit summary matching the most recent edit to the page, but it's failing because the edit summary saved to the database is actually the result of plugging the new section's title into the 'newsectionsummary' message. Patch momentarily.
Change 144603 had a related patch set uploaded by Anomie: Actually detect duplicate section=new submissions https://gerrit.wikimedia.org/r/144603
Change 144603 merged by jenkins-bot: Actually detect duplicate section=new submissions https://gerrit.wikimedia.org/r/144603