a user requests to add me as a friend,im robot exit and crash

[hqlong]

Hello all!
 I based on libpurple of pidgin2.6.6  development  an im robot, the
robot supports msn qq so on  protocol, login, post messages、 receiving
messages and have no problems, but when a user requests to add me as a
friend, this will automatically exit and crash, What is the reason for
this? Hope your can help me. Thank you.

-- 
祝好！
hqlong