Timbers Precached: On startup only
Destroying AudioMixer...
Destroying MidiDriver...
Assertion failed: (self != nullptr), function get_ptr, file Audio.cc, line 231.
Process 64477 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGABRT
    frame #0: 0x00007fff67ffc33a libsystem_kernel.dylib`__pthread_kill + 10
libsystem_kernel.dylib`__pthread_kill:
->  0x7fff67ffc33a <+10>: jae    0x7fff67ffc344            ; <+20>
    0x7fff67ffc33c <+12>: movq   %rax, %rdi
    0x7fff67ffc33f <+15>: jmp    0x7fff67ff6629            ; cerror_nocancel
    0x7fff67ffc344 <+20>: retq
Target 0: (exult) stopped.
(lldb) bt
* thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGABRT
  * frame #0: 0x00007fff67ffc33a libsystem_kernel.dylib`__pthread_kill + 10
    frame #1: 0x00007fff680b8e60 libsystem_pthread.dylib`pthread_kill + 430
    frame #2: 0x00007fff67f83808 libsystem_c.dylib`abort + 120
    frame #3: 0x00007fff67f82ac6 libsystem_c.dylib`__assert_rtn + 314
    frame #4: 0x00000001003f1093 exult`Audio::get_ptr() (.cold.1) + 35
    frame #5: 0x00000001000a71f7 exult`Audio::get_ptr() + 23
    frame #6: 0x00000001000aa48d exult`MyMidiPlayer::init_device(bool) + 109
    frame #7: 0x00000001000aae4e exult`MyMidiPlayer::stop_music() + 110
    frame #8: 0x00000001000b156f exult`Pentagram::AudioMixer::closeMidiOutput() + 143
    frame #9: 0x00000001000b1441 exult`Pentagram::AudioMixer::~AudioMixer() + 129
    frame #10: 0x00000001000a8458 exult`Audio::~Audio() + 104
    frame #11: 0x00000001000a71aa exult`Audio::Destroy() + 26
    frame #12: 0x00000001000404ac exult`exult_main(char const*) + 14572
    frame #13: 0x000000010003b915 exult`main + 1029
    frame #14: 0x00000001000013d4 exult`start + 52
(lldb)