Program received signal SIGSEGV, Segmentation fault.
0x00007ffff6e38cca in ARDOUR::Tempo::frames_per_beat (this=0xffffffffffff7082, sr=44100) at ../libs/ardour/tempo.cc:51
51              return  (60.0 * sr) / _beats_per_minute;
(gdb) bt
#0  0x00007ffff6e38cca in ARDOUR::Tempo::frames_per_beat (this=0xffffffffffff7082, sr=44100) at ../libs/ardour/tempo.cc:51
#1  0x00007ffff6e43ebb in ARDOUR::TempoMap::framewalk_to_beats (this=0x4f2c890, pos=0, distance=0) at ../libs/ardour/tempo.cc:2431
#2  0x00007ffff69e6081 in ARDOUR::BeatsFramesConverter::from (this=0x7fffffffc9a0, frames=36774) at ../libs/ardour/beats_frames_converter.cc:46
#3  0x00007ffff6ba011d in ARDOUR::MidiRegion::set_start_beats_from_start_frames (this=0x7fffdc216bc0) at ../libs/ardour/midi_region.cc:169
#4  0x00007ffff6ba0095 in ARDOUR::MidiRegion::post_set (this=0x7fffdc216bc0, pc=...) at ../libs/ardour/midi_region.cc:161
#5  0x00007ffff4b12a64 in PBD::Stateful::set_values (this=0x7fffdc216be0, node=...) at ../libs/pbd/stateful.cc:211
#6  0x00007ffff6ca0f42 in ARDOUR::Region::_set_state (this=0x7fffdc216bc0, node=..., what_changed=..., send=true) at ../libs/ardour/region.cc:1246
#7  0x00007ffff6ca0e98 in ARDOUR::Region::set_state (this=0x7fffdc216bc0, node=..., version=3000) at ../libs/ardour/region.cc:1236
#8  0x00007ffff6ba0823 in ARDOUR::MidiRegion::set_state (this=0x7fffdc216bc0, node=..., version=3000) at ../libs/ardour/midi_region.cc:293
#9  0x00007ffff6c89cf1 in ARDOUR::RegionFactory::create (srcs=..., node=...) at ../libs/ardour/region_factory.cc:293
#10 0x00007ffff6dc1eb4 in ARDOUR::Session::XMLMidiRegionFactory (this=0x4f12820, node=...) at ../libs/ardour/session_state.cc:1909
#11 0x00007ffff6dc0620 in ARDOUR::Session::XMLRegionFactory (this=0x4f12820, node=..., full=false) at ../libs/ardour/session_state.cc:1740
#12 0x00007ffff6dbf7e6 in ARDOUR::Session::load_regions (this=0x4f12820, node=...) at ../libs/ardour/session_state.cc:1633
#13 0x00007ffff6dbd6ae in ARDOUR::Session::set_state (this=0x4f12820, node=..., version=3000) at ../libs/ardour/session_state.cc:1351
#14 0x00007ffff6db59e8 in ARDOUR::Session::second_stage_init (this=0x4f12820) at ../libs/ardour/session_state.cc:320
#15 0x00007ffff6d0693e in Session (this=0x4f12820, eng=..., fullpath=..., snapshot_name=..., bus_profile=0x0, mix_template=...) at ../libs/ardour/session.cc:194
#16 0x000000000106f66f in ARDOUR_UI::load_session (this=0x2880910, path=..., snap_name=..., mix_template=...) at ../gtk2_ardour/ardour_ui.cc:2787
#17 0x000000000106f22c in ARDOUR_UI::get_session_parameters (this=0x2880910, quit_on_cancel=true, should_be_new=false, load_template=...) at ../gtk2_ardour/ardour_ui.cc:2722
#18 0x0000000001065340 in ARDOUR_UI::startup (this=0x2880910) at ../gtk2_ardour/ardour_ui.cc:720
#19 0x0000000001094f3f in sigc::bound_mem_functor0<void, ARDOUR_UI>::operator() (this=0x2a88fc8) at /usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:1787
#20 0x000000000108f258 in sigc::adaptor_functor<sigc::bound_mem_functor0<void, ARDOUR_UI> >::operator() (this=0x2a88fc0) at /usr/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:251
#21 0x0000000001089947 in sigc::internal::slot_call0<sigc::bound_mem_functor0<void, ARDOUR_UI>, void>::call_it (rep=0x2a88f90) at /usr/include/sigc++-2.0/sigc++/functors/slot.h:103
#22 0x000000000104a8f1 in sigc::internal::signal_emit0<void, sigc::nil>::emit (impl=0x2b222e0) at /usr/include/sigc++-2.0/sigc++/signal.h:776
#23 0x000000000104c94a in sigc::signal0<void, sigc::nil>::emit (this=0x28809d0) at /usr/include/sigc++-2.0/sigc++/signal.h:2671
#24 0x000000000104bc8a in sigc::signal0<void, sigc::nil>::operator() (this=0x28809d0) at /usr/include/sigc++-2.0/sigc++/signal.h:2679
#25 0x00007ffff4f9a8c2 in Gtkmm2ext::UI::run (this=0x2880910, old_receiver=...) at ../libs/gtkmm2ext/gtk_ui.cc:264
#26 0x0000000001507fe6 in main (argc=1, argv=0x7fffffffe048) at ../gtk2_ardour/main.cc:555