When a crash of type "Fatal Error" occurs in the editor, the editor tries to handle the error. However during it's destruction, an abort signal is sent and the clean up doesn't complete properly.
This only seems to occur on a Mac.

Call stack:
__pthread_kill (@__pthread_kill:6)
pthread_kill (@pthread_kill:65)
abort (@abort:41)
abort_message (@abort_message:59)
demangling_terminate_handler() (@demangling_terminate_handler():66)
_objc_terminate() (@_objc_terminate():35)
std::__terminate(void (*)()) (@std::__terminate(void (*)()):8)
std::terminate() (@std::terminate():16)
__clang_call_terminate (@__clang_call_terminate:7)
GfxDoubleCache<unsigned long, unsigned long long, GfxGenericHash<unsigned long>, std::__1::equal_to<unsigned long>, GfxDoubleCacheConcurrencyPolicy::LocklessGet, GfxDoubleCacheDefaultEmptyDeletedGenerator<unsigned long>, (MemLabelIdentifier)83>::~GfxDoubleCache() (/Users/kara.virgo-ammann/unity/Runtime/GfxDevice/utilities/GfxDoubleCache.h:153)
GfxDoubleCache<unsigned long, unsigned long long, GfxGenericHash<unsigned long>, std::__1::equal_to<unsigned long>, GfxDoubleCacheConcurrencyPolicy::LocklessGet, GfxDoubleCacheDefaultEmptyDeletedGenerator<unsigned long>, (MemLabelIdentifier)83>::~GfxDoubleCache() (/Users/kara.virgo-ammann/unity/Runtime/GfxDevice/utilities/GfxDoubleCache.h:151)
__cxa_finalize_ranges (@__cxa_finalize_ranges:91)
exit (@exit:21)
LaunchBugReporter(BugReportMode, dynamic_array<core::basic_string<char, core::StringStorageDefault<char> >, 0ul> const&) (/Users/kara.virgo-ammann/unity/Editor/Platform/OSX/BugReportingTools.mm:74)
LaunchBugReporter(BugReportMode) (/Users/kara.virgo-ammann/unity/Editor/Platform/OSX/BugReportingTools.mm:42)
EditorMonoConsole::LogToConsoleImplementation(CppLogEntry&) (/Users/kara.virgo-ammann/unity/Editor/Src/EditorMonoConsole.cpp:753)
EditorMonoConsole::LogToConsoleImplementation(DebugStringToFileData const&) (/Users/kara.virgo-ammann/unity/Editor/Src/EditorMonoConsole.cpp:657)
LogToConsoleImplementation(DebugStringToFileData const&) (/Users/kara.virgo-ammann/unity/Editor/Src/EditorMonoConsole.cpp:793)
DebugStringToFilePostprocessedStacktrace(DebugStringToFileData const&) (/Users/kara.virgo-ammann/unity/Runtime/Logging/LogAssert.cpp:993)
DebugStringToFile(DebugStringToFileData const&) (/Users/kara.virgo-ammann/unity/Runtime/Logging/LogAssert.cpp:1073)