Qt Creator crashed when I use the "Help Documentation" browser to login Gmail

Steps:
1.Run Qt Creator, set startup homepage of Help mode at "Options.. =>
Help => General Settings => Startup => Home page:", set as
"http://mail.google.com".
2.Close Options dialog, then switch to Help mode. Login Gmail when home
page loading finished. Login success, and after a while, Qt Creator
crash.

To start gdb with the core dump file, can locate the crash at
libQtWebKit.so.4:
"#0 0xb5b1366b in ?? () from /home/chenyi/qtcreator-2.2.0/lib/qtcreator/plugins/Nokia/../../../libQtWebKit.so.4"