Redmine

Hi,

While commenting on an issue on this tracker, I wanted to edit a previous comment I made, but I get this error with both Preview and Save actions:

POST /issues/preview/edit/26398?project_id=redmine HTTP/1.1
Host: www.redmine.org
Connection: keep-alive
Content-Length: 3792
Origin: https://www.redmine.org
X-CSRF-Token: **ANON**
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
Accept: */*
X-Requested-With: XMLHttpRequest
DNT: 1
Referer: https://www.redmine.org/issues/26398
Accept-Encoding: gzip, deflate, br
Accept-Language: en,fr;q=0.8,es;q=0.6
Cookie: _redmine_session=**ANON**

HTTP/1.1 500 Internal Server Error
Date: Mon, 10 Jul 2017 18:57:51 GMT
Server: Apache
X-Request-Id: 8f2c681fa52833bab54e41e06c96b21b
X-Runtime: 26.029286
X-Rack-Cache: invalidate, pass
Vary: Accept-Encoding
Content-Encoding: gzip
Content-Length: 416
Connection: close
Content-Type: text/html; charset=utf-8

However, it works well for new issues and new comments.