Crucible throws MaxRetriesReachedException on commit message with emoji

A commit message with "💜some message" as content will break Crucible. (That's Unicode U+1F49C, as described on http://www.iemoji.com/view/emoji/37/people/purple-heart ).

When adding a commit with that message to a code review, I get the following error:

Server Error
Error 2
URL: /json/cru/CR-REIS-900/editRevisionsAjax/
A com.cenqua.crucible.hibernate.MaxRetriesReachedException was encountered
Unable to execute CrucibleRevisionCreator.createRevisionsInSeparateTransaction after 10 retries. Giving up
You are running release CR3.8.0 FE3.8.0 (20150427140019 2015-04-27), please report your release number when reporting bugs.

This error is in the current version (3.8.0), and has been there since at least 3.1.1.