Update a date field lead to : PHP Catchable fatal error: Argument 1 passed to Tracker_Artifact_Changeset::userCanReadAtLeastOneChangedField() must be an instance of PFUser, null given, called in /usr/share/codendi/plugins/tracker/include/Tracker/Artifact/Tracker_Artifact_Changeset.class.php on line 611 and defined in /usr/share/codendi/plugins/tracker/include/Tracker/Artifact/Tracker_Artifact_Changeset.class.php on line 618, referer: https://my.enalean.com/plugins/tracker/?aid=6075&func=edit