netradiant pthread crash on macos #2

$ lldb ../../install/macos-clang/netradiant
(lldb) target create "../../install/macos-clang/netradiant"
Current executable set to '../../install/macos-clang/netradiant' (x86_64).
(lldb) r
Process 93133 launched: '/Users/illwieckz/dev/netradiant/install/macos-clang/netradiant' (x86_64)
Assertion failed: (s->stack->next != NULL), function CGGStackRestore, file /BuildRoot/Library/Caches/com.apple.xbs/Sources/CoreGraphics/CoreGraphics-1260.2/CoreGraphics/Context/CGGStack.c, line 77.
Process 93133 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGABRT
    frame #0: 0x00007fff6832d2c6 libsystem_kernel.dylib`__pthread_kill + 10
libsystem_kernel.dylib`__pthread_kill:
->  0x7fff6832d2c6 <+10>: jae    0x7fff6832d2d0            ; <+20>
    0x7fff6832d2c8 <+12>: movq   %rax, %rdi
    0x7fff6832d2cb <+15>: jmp    0x7fff68327457            ; cerror_nocancel
    0x7fff6832d2d0 <+20>: retq
Target 0: (netradiant) stopped.
(lldb) thread backtrace all
* thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGABRT
  * frame #0: 0x00007fff6832d2c6 libsystem_kernel.dylib`__pthread_kill + 10
    frame #1: 0x00007fff683e8bf1 libsystem_pthread.dylib`pthread_kill + 284
    frame #2: 0x00007fff682976a6 libsystem_c.dylib`abort + 127
    frame #3: 0x00007fff6826020d libsystem_c.dylib`__assert_rtn + 324
    frame #4: 0x00007fff3c65ad19 CoreGraphics`CGGStackRestore + 143
    frame #5: 0x00007fff3c65ac6a CoreGraphics`CGContextRestoreGState + 32
    frame #6: 0x00000001015061ad libcairo.2.dylib`_cairo_quartz_surface_finish + 39
    frame #7: 0x00000001014e83e3 libcairo.2.dylib`_cairo_surface_finish + 26
    frame #8: 0x00000001014e74af libcairo.2.dylib`cairo_surface_destroy + 97
    frame #9: 0x000000010149b4e6 libcairo.2.dylib`_cairo_user_data_array_fini + 58
    frame #10: 0x00000001014a88a7 libcairo.2.dylib`_cairo_default_context_destroy + 14
    frame #11: 0x000000010033b483 netradiant`XORRectangle::~XORRectangle(this=0x0000000105010c68) at xorrectangle.cpp:38:9
    frame #12: 0x000000010033b4a5 netradiant`XORRectangle::~XORRectangle(this=0x0000000105010c68) at xorrectangle.cpp:36:1
    frame #13: 0x000000010030155a netradiant`XYWnd::~XYWnd(this=0x0000000105010c00) at xywindow.cpp:874:1
    frame #14: 0x0000000100301595 netradiant`XYWnd::~XYWnd(this=0x0000000105010c00) at xywindow.cpp:860:16
    frame #15: 0x000000010017f04d netradiant`MainFrame::Shutdown(this=0x0000000103007660) at mainframe.cpp:3268:2
    frame #16: 0x000000010017eddb netradiant`MainFrame::~MainFrame(this=0x0000000103007660) at mainframe.cpp:2774:2
    frame #17: 0x000000010017f1f5 netradiant`MainFrame::~MainFrame(this=0x0000000103007660) at mainframe.cpp:2769:24
    frame #18: 0x00000001001726bf netradiant`main(argc=1, argv=0x00007ffeefbff9e8) at main.cpp:646:2
    frame #19: 0x00007fff681f23d5 libdyld.dylib`start + 1
    frame #20: 0x00007fff681f23d5 libdyld.dylib`start + 1
  thread #3
    frame #0: 0x00007fff68328bfe libsystem_kernel.dylib`__workq_kernreturn + 10
    frame #1: 0x00007fff683e5636 libsystem_pthread.dylib`_pthread_wqthread + 458
    frame #2: 0x00007fff683e53fd libsystem_pthread.dylib`start_wqthread + 13
  thread #4
    frame #0: 0x00007fff68328bfe libsystem_kernel.dylib`__workq_kernreturn + 10
    frame #1: 0x00007fff683e5636 libsystem_pthread.dylib`_pthread_wqthread + 458
    frame #2: 0x00007fff683e53fd libsystem_pthread.dylib`start_wqthread + 13
  thread #5
    frame #0: 0x00007fff68328bfe libsystem_kernel.dylib`__workq_kernreturn + 10
    frame #1: 0x00007fff683e56e6 libsystem_pthread.dylib`_pthread_wqthread + 634
    frame #2: 0x00007fff683e53fd libsystem_pthread.dylib`start_wqthread + 13
  thread #6
    frame #0: 0x00007fff6832a86a libsystem_kernel.dylib`__psynch_cvwait + 10
    frame #1: 0x00007fff683e956e libsystem_pthread.dylib`_pthread_cond_wait + 722
    frame #2: 0x00000001012aee01 libgdk-quartz-2.0.0.dylib`select_thread_func + 64
    frame #3: 0x00007fff683e62eb libsystem_pthread.dylib`_pthread_body + 126
    frame #4: 0x00007fff683e9249 libsystem_pthread.dylib`_pthread_start + 66
    frame #5: 0x00007fff683e540d libsystem_pthread.dylib`thread_start + 13
  thread #7
    frame #0: 0x00007fff68328bfe libsystem_kernel.dylib`__workq_kernreturn + 10
    frame #1: 0x00007fff683e56e6 libsystem_pthread.dylib`_pthread_wqthread + 634
    frame #2: 0x00007fff683e53fd libsystem_pthread.dylib`start_wqthread + 13
  thread #8
    frame #0: 0x0000000000000000