[CrashReport] UE4Editor-CoreUObject.dylib!UObject::Rename()

[2017.09.14-14.27.27:171][ 34]LogMetal: Display: Loaded a text shader (will be slower to load)
[2017.09.14-14.28.12:314][133]LogTextFormatter: Warning: Failed to parse argument "ExistingAsset" as a number (using "0" as a fallback). Please check your format string for errors: "{ExistingAsset} already exists. Do you want to replace it?".
[2017.09.14-14.28.15:093][133]LogMac: Error: appError called: Assertion failed: Assertion failed:  [File:/Users/build/Build/++UE4+Release-4.17+Compile/Sync/Engine/Source/Runtime/CoreUObject/Private/UObject/Obj.cpp] [Line: 198] 
Renaming an object (Package /Temp/Untitled_5_BuiltData) on top of an existing object (Package /Game/Untitled_BuiltData) is not allowed

[2017.09.14-14.28.15:207][133]LogMac: === Critical error: ===
SIGSEGV: invalid attempt to access memory at address 0x3

[2017.09.14-14.28.15:207][133]LogMac: FGenericPlatformMisc::RaiseException(unsigned int) Address = 0xc263adb  (filename not found) [in UE4Editor-Core.dylib]
FOutputDeviceMacError::Serialize(wchar_t const*, ELogVerbosity::Type, FName const&) Address = 0xc47b08f  (filename not found) [in UE4Editor-Core.dylib]
FOutputDevice::Logf(wchar_t const*, ...) Address = 0xc5618fd  (filename not found) [in UE4Editor-Core.dylib]
FDebug::AssertFailed(char const*, char const*, int, wchar_t const*, ...) Address = 0xc4b47ce  (filename not found) [in UE4Editor-Core.dylib]
UObject::Rename(wchar_t const*, UObject*, unsigned int) Address = 0xe0ff41a  (filename not found) [in UE4Editor-CoreUObject.dylib]
UWorld::Rename(wchar_t const*, UObject*, unsigned int) Address = 0x101bbbd6 (filename not found) [in UE4Editor-Engine.dylib]
SaveWorld(UWorld*, FString const*, wchar_t const*, wchar_t const*, bool, bool, FString&, bool, bool) Address = 0x152b66a1 (filename not found) [in UE4Editor-UnrealEd.dylib]
FEditorFileUtils::SaveMap(UWorld*, FString const&) Address = 0x152b432d (filename not found) [in UE4Editor-UnrealEd.dylib]
SaveAsImplementation(UWorld*, FString const&, bool, FString*) Address = 0x152a0dc3 (filename not found) [in UE4Editor-UnrealEd.dylib]
FEditorFileUtils::SaveLevelAs(ULevel*, FString*) Address = 0x1529f457 (filename not found) [in UE4Editor-UnrealEd.dylib]
FLevelEditorActionCallbacks::SaveCurrentAs() Address = 0x2810be90 (filename not found) [in UE4Editor-LevelEditor.dylib]
TBaseStaticDelegateInstance<void ()>::ExecuteIfSafe() const Address = 0x281c0387 (filename not found) [in UE4Editor-LevelEditor.dylib]
FUICommandList::ExecuteAction(TSharedRef<FUICommandInfo const, (ESPMode)0>) const Address = 0x137094d5 (filename not found) [in UE4Editor-Slate.dylib]
invocation function for block in FSlateMacMenu::ExecuteMenuItemAction(TSharedRef<FMenuEntryBlock const, (ESPMode)0> const&) Address = 0x137e3ebc (filename not found) [in UE4Editor-Slate.dylib]
FCocoaRunLoopSource::Process(__CFString const*) Address = 0xc436a44  (filename not found) [in UE4Editor-Core.dylib]
-[FCocoaRunLoopSourceInfo perform] Address = 0xc436496  (filename not found) [in UE4Editor-Core.dylib]
__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__() Address = 0x9fd8c321 (filename not found) [in CoreFoundation]
__CFRunLoopDoSources0() Address = 0x9fd6d21d (filename not found) [in CoreFoundation]
__CFRunLoopRun() Address = 0x9fd6c716 (filename not found) [in CoreFoundation]
CFRunLoopRunSpecific() Address = 0x9fd6c114 (filename not found) [in CoreFoundation]
PerformBlockOnThread(FCocoaRunLoopSource&, void () block_pointer, NSArray*, NSString*, bool) Address = 0xc4373da  (filename not found) [in UE4Editor-Core.dylib]
FMacApplication::UpdateScreensArray() Address = 0xc43fb29  (filename not found) [in UE4Editor-Core.dylib]
FMacApplication::ProcessDeferredEvents(float) Address = 0xc43f7a0  (filename not found) [in UE4Editor-Core.dylib]
FSlateApplication::TickPlatform(float) Address = 0x136a266b (filename not found) [in UE4Editor-Slate.dylib]
FSlateApplication::Tick(ESlateTickType) Address = 0x136a1aa4 (filename not found) [in UE4Editor-Slate.dylib]
FEngineLoop::Tick() Address = 0xc15e011  (filename not found) [in UE4Editor]
GuardedMain(wchar_t const*) Address = 0xc164c22  (filename not found) [in UE4Editor]
-[UE4AppDelegate runGameThread:] Address = 0xc1725d0  (filename not found) [in UE4Editor]
-[FCocoaGameThread main] Address = 0xc436cc6  (filename not found) [in UE4Editor-Core.dylib]
__NSThread__start__() Address = 0xa178f8ad (filename not found) [in Foundation]
_pthread_body() Address = 0xb570593b (filename not found) [in libsystem_pthread.dylib]
_pthread_body() Address = 0xb5705887 (filename not found) [in libsystem_pthread.dylib]
thread_start() Address = 0xb570508d (filename not found) [in libsystem_pthread.dylib]

SEGV_MAPERR at 0x3

UE4Editor-CoreUObject.dylib!UObject::Rename()
UE4Editor-Engine.dylib!UWorld::Rename()
UE4Editor-UnrealEd.dylib!SaveWorld()
UE4Editor-UnrealEd.dylib!FEditorFileUtils::SaveMap()
UE4Editor-UnrealEd.dylib!SaveAsImplementation()
UE4Editor-UnrealEd.dylib!FEditorFileUtils::SaveLevelAs()
UE4Editor-LevelEditor.dylib!FLevelEditorActionCallbacks::SaveCurrentAs()
UE4Editor-LevelEditor.dylib!TBaseStaticDelegateInstance<void ()>::ExecuteIfSafe()
UE4Editor-Slate.dylib!FUICommandList::ExecuteAction(TSharedRef<FUICommandInfo const,()
UE4Editor-Slate.dylib!<Unknown>
UE4Editor-Core.dylib!FCocoaRunLoopSource::Process()
UE4Editor-Core.dylib!<Unknown>
CoreFoundation!Unknown()
CoreFoundation!Unknown()
CoreFoundation!Unknown()
CoreFoundation!Unknown()
UE4Editor-Core.dylib!PerformBlockOnThread(FCocoaRunLoopSource&, void()
UE4Editor-Core.dylib!FMacApplication::UpdateScreensArray()
UE4Editor-Core.dylib!FMacApplication::ProcessDeferredEvents()
UE4Editor-Slate.dylib!FSlateApplication::TickPlatform()
UE4Editor-Slate.dylib!FSlateApplication::Tick()
UE4Editor!FEngineLoop::Tick()
UE4Editor!GuardedMain()
UE4Editor!<Unknown>
UE4Editor-Core.dylib!<Unknown>
Foundation!Unknown()
libsystem_pthread.dylib!<Unknown>
libsystem_pthread.dylib!<Unknown>
libsystem_pthread.dylib!<Unknown>