Hi all, Sometimes my app crashes with an assertion: Assertion failed: (CFReadStreamGetStatus(_stream.get()) == kCFStreamStatusNotOpen), function _onqueue_setupStream_block_invoke, file /Library/Caches/com.apple.xbs/Sources/CFNetwork/CFNetwork-1126/HTTP/Core/IO/HTTPRequestBody.cpp, line 861. The stack trace is not very useful as well: Thread 11 name: Thread 11 Crashed: 0	 libsystem_kernel.dylib				 0x00000001892ed9a4 __pthread_kill + 8 1	 libsystem_pthread.dylib			 0x00000001891fdc64 pthread_kill + 272 (pthread.c:1375) 2	 libsystem_c.dylib						 0x0000000189185c74 __abort + 116 (abort.c:147) 3	 libsystem_c.dylib						 0x0000000189185c00 abort + 116 (abort.c:118) 4	 libsystem_c.dylib						 0x0000000189184f10 __assert_rtn + 292 (assert.c:96) 5	 CFNetwork										 0x000000018cd3969c invocation function for block in RequestBodyStream::_onqueue_setupStream() + 256 (HTTPRequestBody.cpp:871) 6	 libdispatch.dylib						 0x0000000189192394 _dispatch_client_callout + 20 (object.m:559) 7	 libdispatch.dylib						 0x0000000189195a6c _dispatch_block_invoke_direct + 268 (queue.c:468) 8	 CFNetwork										 0x000000018cd9b9b8 RunloopBlockContext::_invoke_block(void const*, void*) + 44 (CoreSchedulingSet.mm:367) 9	 CoreFoundation								 0x00000001894096a4 CFArrayApplyFunction + 84 (CFArray.c:699) 10	CFNetwork										 0x000000018cd9b8cc RunloopBlockContext::perform() + 132 (CoreSchedulingSet.mm:321) 11	CFNetwork										 0x000000018cd9de80 MultiplexerSource::_perform(void*) + 304 (CFNRunLoopMultiplexer.c:267) 12	CoreFoundation								 0x0000000189473124 CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION + 28 (CFRunLoop.c:1967) 13	CoreFoundation								 0x0000000189473068 __CFRunLoopDoSource0 + 176 (CFRunLoop.c:2011) 14	CoreFoundation								 0x000000018947268c __CFRunLoopDoSources0 + 240 (CFRunLoop.c:2048) 15	CoreFoundation								 0x000000018946cd7c __CFRunLoopRun + 828 (CFRunLoop.c:2925) 16	CoreFoundation								 0x000000018946c630 CFRunLoopRunSpecific + 564 (CFRunLoop.c:3242) 17	CFNetwork										 0x000000018cd9c9ac +[__CFN_CoreSchedulingSetRunnable _run:] + 592 (CoreSchedulingSet.mm:1374) 18	Foundation										 0x00000001899692f8 NSThreadstart__ + 864 (NSThread.m:724) 19	libsystem_pthread.dylib			 0x00000001891fcc98 _pthread_start + 320 (pthread.c:880) 20	libsystem_pthread.dylib			 0x0000000189205788 thread_start + 8 Is there anything that I can try to understand what it's causing the crash?