WSEngine.stop(closeCode:) + 124 (WSEngine.swift:75) crash

[MennyASam]

Thread 1 Crashed: 0 libswiftCore.dylib 0x0000000196211bb4 swift::RefCounts<swift::RefCountBitsT<(swift::RefCountInlinedness)1> >::formWeakReference() + 60 (atomic:970) 1 libswiftCore.dylib 0x00000001961f0660 swift_weakInit + 28 (WeakReference.h:205) 2 libswiftCore.dylib 0x00000001961f0660 swift_weakInit + 28 (WeakReference.h:205) 3 SamTools 0x0000000105583a64 WSEngine.stop(closeCode:) + 124 (WSEngine.swift:75) 4 SamTools 0x0000000105584f74 protocol witness for Engine.stop(closeCode:) in conformance WSEngine + 20 (:0) 5 SamTools 0x00000001054d4824 closure #1 in SocketWrapper.disconnect() + 152 (WebSocket.swift:140) 6 SamTools 0x00000001054e0eb0 thunk for @escaping @callee_guaranteed () -> () + 20 (:0) 7 libdispatch.dylib 0x0000000192149298 _dispatch_call_block_and_release + 24 (init.c:1454) 8 libdispatch.dylib 0x000000019214a280 _dispatch_client_callout + 16 (object.m:559) 9 libdispatch.dylib 0x00000001920fc074 _dispatch_root_queue_drain + 688 (inline_internal.h:2548) 10 libdispatch.dylib 0x00000001920fc704 _dispatch_worker_thread2 + 124 (queue.c:6777) 11 libsystem_pthread.dylib 0x00000001d8b72568 _pthread_wqthread + 212 (pthread.c:2219) 12 libsystem_pthread.dylib 0x00000001d8b75874 start_wqthread + 8