Unicode (UTF-16) problems

XenForo is amazing!

I am from Hong Kong and I have just tried out the demo. I found that when I want to create a thread with UTF-16 character, a problem is occured and saying:
Mysqli statement execute error : Incorrect string value: '\xF0\xA0\x9D\xB9\xE5\x88...' for column 'message' at row 1
It may be just a little problem... But may it be solved? Thank you.:)