I suspect this crash started happening after my company moved my account to the new Lync 2013 server.
Backtrace:
0 0x0000003c59635c39 in raise () from /lib64/libc.so.6
1 0x0000003c59637348 in abort () from /lib64/libc.so.6
2 0x0000000000480d4a in sighandler ()
3 <signal handler="" called="">
4 0x00007f3a97207dd4 in sip_transport_bye () from /usr/lib64/purple-2/libsipe.so
5 0x00007f3a972153cc in groupchat_expired_session_response () from /usr/lib64/purple-2/libsipe.so
8 0x00000000004696ae in pidgin_io_invoke ()
9 0x0000003c5be492a6 in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
10 0x0000003c5be49628 in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
11 0x0000003c5be49a3a in g_main_loop_run () from /lib64/libglib-2.0.so.0
12 0x0000003379345c27 in gtk_main () from /lib64/libgtk-x11-2.0.so.0
13 0x000000000043160f in main ()
Fixed by commit 9084e28.
Please note: judging from your log you are not allowed to use Persistent Chat. The above commit will fix your crash, but you will not be able to use Persistent Chat.