Sorry for the delay. Currently release 5.1.4 and kicad-5.1-unified-20190911-052317-ff80747ca-10_14.dmg both crashes under the same circumstances and with apparently the same results as in the original report.

Process:               kicad [59326]
Path:                  /private/var/folders/*/kicad.app/Contents/MacOS/kicad
Identifier:            org.kicad-pcb.kicad
Version:               5.1.4-br-unknown (???)
Code Type:             X86-64 (Native)
Parent Process:        ??? [1]
Responsible:           kicad [59326]
User ID:               502

Date/Time:             2019-09-11 17:57:14.911 -0700
OS Version:            Mac OS X 10.14.5 (18F132)
Report Version:        12
Bridge OS Version:     3.5 (16P5125)
Anonymous UUID:        2F535EFB-DC41-6579-093D-77E72102AE39

Sleep/Wake UUID:       F9391440-829B-4A43-A77B-547DBC272F66

Time Awake Since Boot: 690000 seconds
Time Since Wake:       6900 seconds

System Integrity Protection: enabled

Notes:                 Translocated Process

Crashed Thread:        10

Exception Type:        EXC_BAD_ACCESS (SIGSEGV)
Exception Codes:       KERN_INVALID_ADDRESS at 0x00000000000001d0
Exception Note:        EXC_CORPSE_NOTIFY

Termination Signal:    Segmentation fault: 11
Termination Reason:    Namespace SIGNAL, Code 0xb
Terminating Process:   exc handler [59326]

***

Thread 10 Crashed:
0   libngspice.0.dylib            	0x000000011f6d4c5d MIFsetup + 109
1   libngspice.0.dylib            	0x000000012b3da3d6 CKTsetup + 214
2   libngspice.0.dylib            	0x000000012b3d41b1 CKTdoJob + 961
3   libngspice.0.dylib            	0x000000012afe3050 if_run + 1296
4   libngspice.0.dylib            	0x000000012afe013e dosim + 894
5   libngspice.0.dylib            	0x000000012afaf8cb docommand + 299
6   libngspice.0.dylib            	0x000000012afaeece doblock + 126
7   libngspice.0.dylib            	0x000000012afaeca3 cp_evloop + 2547
8   libngspice.0.dylib            	0x000000012afa5531 _thread_run + 65
9   libsystem_pthread.dylib       	0x00007fff75de62eb _pthread_body + 126
10  libsystem_pthread.dylib       	0x00007fff75de9249 _pthread_start + 66
11  libsystem_pthread.dylib       	0x00007fff75de540d thread_start + 13

Thread 10 crashed with X86 Thread State (64-bit):
  rax: 0x0000600003e10d40  rbx: 0x000000012b4fcc90  rcx: 0x0000000000000000  rdx: 0x000000000000003a
  rdi: 0x00007f95433521f0  rsi: 0x00006000024c2b40  rbp: 0x000070000a09d870  rsp: 0x000070000a09d7e0
   r8: 0x0000000000000000   r9: 0x00007f952f9082a0  r10: 0x000000012b4fce10  r11: 0xffffeffff9d0c230
  r12: 0x00006000024c2b40  r13: 0x0000000000000000  r14: 0x000000000000003a  r15: 0x00007f9543311530
  rip: 0x000000011f6d4c5d  rfl: 0x0000000000010202  cr2: 0x00000000000001d0

*** 

Application: KiCad
Version: (5.1.4-79-gff80747ca), debug build
Libraries:
    wxWidgets 3.0.4
    libcurl/7.54.0 LibreSSL/2.6.5 zlib/1.2.11 nghttp2/1.24.1
Platform: Mac OS X (Darwin 18.6.0 x86_64), 64 bit, Little endian, wxMac
Build Info:
    wxWidgets: 3.0.4 (wchar_t,STL containers,compatible with 2.8)
    Boost: 1.69.0
    OpenCASCADE Community Edition: 6.9.1
    Curl: 7.54.0
    Compiler: Clang 9.0.0 with C++ ABI 1002

Build settings:
    USE_WX_GRAPHICS_CONTEXT=ON
    USE_WX_OVERLAY=ON
    KICAD_SCRIPTING=ON
    KICAD_SCRIPTING_MODULES=ON
    KICAD_SCRIPTING_PYTHON3=OFF
    KICAD_SCRIPTING_WXPYTHON=ON
    KICAD_SCRIPTING_WXPYTHON_PHOENIX=OFF
    KICAD_SCRIPTING_ACTION_MENU=ON
    BUILD_GITHUB_PLUGIN=ON
    KICAD_USE_OCE=ON
    KICAD_USE_OCC=OFF
    KICAD_SPICE=ON