[CrashReport] Mac crash - libobjc.A.dylib!objc_retain() [UnknownFile]

[2017.11.09-19.23.22:392][ 63]LogMaterial: Missing cached shader map for material FMatExpressionPreview MaterialExpressionVectorParameter_0, compiling. 
[2017.11.09-19.23.22:402][ 63]LogSlate: Took 0.000460 seconds to synchronously load lazily loaded font '../../../Engine/Content/Editor/Slate/Fonts/Roboto-BoldCondensed.ttf' (158K)
[2017.11.09-19.23.22:739][ 64]LogSlate: Took 0.002179 seconds to synchronously load lazily loaded font '../../../Engine/Content/Editor/Slate/Fonts/Roboto-Italic.ttf' (157K)
[2017.11.09-19.23.23:652][ 83]MaterialEditorStats: Texture samplers: 2/16
[2017.11.09-19.23.25:957][156]LogMaterial: Missing cached shader map for material Wings, compiling. 
[2017.11.09-19.23.29:404][282]MaterialEditorStats: Texture samplers: 2/16
[2017.11.09-19.23.30:431][329]LogMac: === Critical error: ===
SIGSEGV: invalid attempt to access memory at address 0x20

[2017.11.09-19.23.30:431][329]LogMac: 0xbea68f31 libobjc.A.dylib!objc_retain()   [UnknownFile]) 
0xa9b5c6c5 CoreFoundation!+[__NSDictionaryI __new:::::]   [UnknownFile]) 
0xa9b5c390 CoreFoundation!-[__NSPlaceholderDictionary initWithObjects:forKeys:count:]   [UnknownFile]) 
0xa785b2c1 AppKit!-[NSWindow _copyPublicPersistentUIInfo]   [UnknownFile]) 
0xa7858f5f AppKit!recursivelyEncodeInvalidPersistentState()   [UnknownFile]) 
0xa78576c3 AppKit!-[NSPersistentUIManager flushAllChangesOptionallyWaitingUntilDone:updatingSnapshots:]   [UnknownFile]) 
0xa785716f AppKit!-[NSPersistentUIManager flushPersistentStateAndClose:waitingUntilDone:]   [UnknownFile]) 
0xa7857051 AppKit!__42-[NSPersistentUIManager acquireDirtyState]_block_invoke   [UnknownFile]) 
0xbf3278fc libdispatch.dylib!_dispatch_client_callout()   [UnknownFile]) 
0xbf33ca16 libdispatch.dylib!_dispatch_continuation_pop()   [UnknownFile]) 
0xbf332a6c libdispatch.dylib!_dispatch_source_latch_and_call()   [UnknownFile]) 
0xbf32a13b libdispatch.dylib!_dispatch_source_invoke()   [UnknownFile]) 
0xbf334908 libdispatch.dylib!_dispatch_main_queue_callback_4CF()   [UnknownFile]) 
0xa9c14bc9 CoreFoundation!__CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__()   [UnknownFile]) 
0xa9bd5c0d CoreFoundation!__CFRunLoopRun()   [UnknownFile]) 
0xa9bd5114 CoreFoundation!CFRunLoopRunSpecific()   [UnknownFile]) 
0xa9135ebc HIToolbox!RunCurrentEventLoopInMode()   [UnknownFile]) 
0xa9135cf1 HIToolbox!ReceiveNextEventCommon()   [UnknownFile]) 
0xa9135b26 HIToolbox!_BlockUntilNextEventMatchingListInModeWithFilter()   [UnknownFile]) 
0xa76cea54 AppKit!_DPSNextEvent()   [UnknownFile]) 
0xa7e4a7ee AppKit!-[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:]   [UnknownFile]) 
0xa76c33db AppKit!-[NSApplication run]   [UnknownFile]) 
0x0460fedf UE4Editor!tchar_main(int, wchar_t**)   [UnknownFile]) 
0x0460f7a9 UE4Editor!main()   [UnknownFile]) 
0xbf35d235 libdyld.dylib!start()   [UnknownFile]) 

libobjc.A.dylib!Unknown()
CoreFoundation!Unknown()
CoreFoundation!Unknown()
AppKit!<Unknown>
AppKit!<Unknown>
AppKit!<Unknown>
AppKit!<Unknown>
AppKit!<Unknown>
libdispatch.dylib!<Unknown>
libdispatch.dylib!<Unknown>
libdispatch.dylib!<Unknown>
libdispatch.dylib!<Unknown>
libdispatch.dylib!<Unknown>
CoreFoundation!Unknown()
CoreFoundation!Unknown()
CoreFoundation!Unknown()
HIToolbox!<Unknown>
HIToolbox!<Unknown>
HIToolbox!<Unknown>
AppKit!<Unknown>
AppKit!-[NSApplication()
AppKit!<Unknown>
UE4Editor!tchar_main()
UE4Editor!<Unknown>
libdyld.dylib!<Unknown>