Crash on guild BBS scrollbar

Description of the bug: (optional screenshot/video):
Game client crashes upon clicking the lower scrollbar in guild BBS when editing any post containing answers from guildies. Error output "-2147467261" invalid pointer.
http://scrollguide.com/video/bbsbug.mp4
What is supposed to happen?: No. I guess it fails to get to display answers/comments when editing post.
Where did you find and/or notice this bug?: In guild BBS.
A step-by-step guide to re-producing this bug (optional): By editing any guild BBS post containing comments/answers, and clicking the lower scrollbar.
Extra information (optional):