Program terminated with signal SIGSEGV, Segmentation fault.
#0  ast_format_cap_get_compatible (cap1=0x0, cap2=0x7fb6d416c898, result=0x7fb6d416c8f8) at format_cap.c:635
635             for (idx = 0; idx < AST_VECTOR_SIZE(&cap1->preference_order); ++idx) {

0  ast_format_cap_get_compatible (cap1=0x0, cap2=0x7fb6d416c898, result=0x7fb6d416c8f8) at format_cap.c:635
#1  0x00007fb70489a2cc in generate_session_refresh_sdp (session=0x7fb6d407f620) at res_pjsip_session.c:1491
#2  sip_session_refresh (queued=0, media_state=0x7fb654000910, generate_new_sdp=1, method=AST_SIP_SESSION_REFRESH_METHOD_INVITE, on_response=<optimized out>, on_sdp_creation=<optimized out>, on_request_creation=0x0, 
    session=0x7fb6d407f620) at res_pjsip_session.c:1808
#3  ast_sip_session_refresh (session=0x7fb6d407f620, on_request_creation=on_request_creation@entry=0x0, on_sdp_creation=on_sdp_creation@entry=0x0, on_response=on_response@entry=0x7fb7044787b0 <on_topology_change_response>, 
    method=method@entry=AST_SIP_SESSION_REFRESH_METHOD_INVITE, generate_new_sdp=generate_new_sdp@entry=1, media_state=0x7fb654000910) at res_pjsip_session.c:1859
#4  0x00007fb7044797a8 in send_topology_change_refresh (data=0x7fb6540b5c70) at chan_pjsip.c:1576
#5  0x00000000005865e8 in ast_taskprocessor_execute (tps=tps@entry=0x7fb6d4175620) at taskprocessor.c:1237
#6  0x000000000058dfe8 in execute_tasks (data=0x7fb6d4175620) at threadpool.c:1354
#7  0x00000000005865e8 in ast_taskprocessor_execute (tps=0x29334c0) at taskprocessor.c:1237
#8  0x000000000058e794 in threadpool_execute (pool=0x2933020) at threadpool.c:367
#9  worker_active (worker=0x7fb6e4000930) at threadpool.c:1137
#10 worker_start (arg=arg@entry=0x7fb6e4000930) at threadpool.c:1056
#11 0x0000000000596cec in dummy_start (data=<optimized out>) at utils.c:1249
#12 0x00007fb76e958684 in start_thread () from /lib64/libpthread.so.0
#13 0x00007fb76debfeed in clone () from /lib64/libc.so.6