Crash in FoundationStream.write(data:), similar to https://github.com/socketio/socket.io-client-swift/issues/1118

[TarasGordienko]

Crash happens rarely in crashlytics. Seems to be similar to #1118, however empty closure exists only in 2 places in code and replacing it with nil does not solve the issue (

socket.io-client-swift/Source/SocketIO/Engine/SocketEngine.swift

Line 363 in 36db2ff

postWait.append((String(SocketEnginePacketType.close.rawValue), {}))

,

socket.io-client-swift/Source/SocketIO/Engine/SocketEnginePollable.swift

Line 229 in f7ef126

postWait.append((bin, {}))

)

Crashed: NSOperationQueue 0x11dbe7160 (QOS: UNSPECIFIED)
0 libobjc.A.dylib 0x184458050 objc_msgSend + 16
1 Starscream 0x1018a1d0c FoundationStream.write(data:) + 241 (WebSocket.swift:241)
2 Starscream 0x1018a2bac protocol witness for WSStream.write(data:) in conformance FoundationStream ()
3 Starscream 0x1018a9bd8 closure #1 in WebSocket.dequeueWrite(_:code:writeCompletion:) + 1268 (WebSocket.swift:1268)
4 Starscream 0x1018a0400 thunk for @escaping @callee_guaranteed () -> () ()
5 Foundation 0x184b11c60 NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK + 24
6 Foundation 0x184a137e8 -[NSBlockOperation main] + 104
7 Foundation 0x184b13fbc NSOPERATION_IS_INVOKING_MAIN + 24
8 Foundation 0x184a13464 -[NSOperation start] + 740
9 Foundation 0x184b149e8 NSOPERATIONQUEUE_IS_STARTING_AN_OPERATION + 24
10 Foundation 0x184b144a8 __NSOQSchedule_f + 184
11 libdispatch.dylib 0x1843f53ac _dispatch_block_async_invoke2 + 144
12 libdispatch.dylib 0x1843e900c _dispatch_client_callout + 20
13 libdispatch.dylib 0x1843eb78c _dispatch_continuation_pop + 408
14 libdispatch.dylib 0x1843eaeec _dispatch_async_redirect_invoke + 596
15 libdispatch.dylib 0x1843f7bd4 _dispatch_root_queue_drain + 348
16 libdispatch.dylib 0x1843f8384 _dispatch_worker_thread2 + 120
17 libsystem_pthread.dylib 0x18444ea60 _pthread_wqthread + 216
18 libsystem_pthread.dylib 0x184454c78 start_wqthread + 8