Image async crash

ver : cocos2d-x 3.15.1

image async is in use.
However, there is an irregular crash log.
Do you have any idea why?

Device: iPhone 7 Plus

RAM Free: 7.5%

Disk Free: 51%

#13. Crashed: com.apple.root.default-qos
0 libclosured.dylib 0x1c4c2af60 (Missing)
1 libdispatch.dylib 0x18402d088 _dispatch_call_block_and_release + 24
2 libdispatch.dylib 0x18402d048 _dispatch_client_callout + 16
3 libdispatch.dylib 0x184034090 _dispatch_queue_override_invoke$VARIANT$mp + 716
4 libdispatch.dylib 0x18403a1c8 _dispatch_root_queue_drain + 596
5 libdispatch.dylib 0x184039f10 _dispatch_worker_thread3 + 120
6 libsystem_pthread.dylib 0x1842d3120 _pthread_wqthread + 1268
7 libsystem_pthread.dylib 0x1842d2c20 start_wqthread + 4

#0. com.apple.main-thread
0 libsystem_platform.dylib 0x1842ce8e8 OSAtomicEnqueue$VARIANT$mp + 40
1 gameName 0x10117c090 std::__1::__vector_base<std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator >, std::__1::allocator<std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator > > >::~__vector_base() + 7895664
2 libsystem_c.dylib 0x184131bb8 __cxa_finalize_ranges + 384
3 libsystem_c.dylib 0x1840db0a0 exit + 24
4 UIKit 0x18db6867c -[UIApplication applicationWillTerminate] + 474
5 UIKit 0x18dfdfd64 __98-[__UICanvasLifecycleMonitor_Compatability deactivateEventsOnly:withContext:forceExit:completion:]_block_invoke.271 + 344
6 UIKit 0x18dd50f74 _runAfterCACommitDeferredBlocks + 292
7 UIKit 0x18dd44318 _cleanUpAfterCAFlushAndRunDeferredBlocks + 288
8 UIKit 0x18dad3ac8 _afterCACommitHandler + 132
9 CoreFoundation 0x184651848 CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION + 32
10 CoreFoundation 0x18464f200 __CFRunLoopDoObservers + 412
11 CoreFoundation 0x18464f7bc __CFRunLoopRun + 1292
12 CoreFoundation 0x18456ffb8 CFRunLoopRunSpecific + 436
13 GraphicsServices 0x186407f84 GSEventRunModal + 100
14 UIKit 0x18db442f4 UIApplicationMain + 208
15 gameName 0x100eaf5d8 main (main.m:5)
16 libdyld.dylib 0x18409256c start + 4

#1. Thread
0 libsystem_kernel.dylib 0x1841c1dbc __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x1842d2fa0 _pthread_wqthread + 884
2 libsystem_pthread.dylib 0x1842d2c20 start_wqthread + 4

#2. com.apple.uikit.eventfetch-thread
0 libsystem_kernel.dylib 0x1841a0bc4 mach_msg_trap + 8
1 libsystem_kernel.dylib 0x1841a0a3c mach_msg + 72
2 CoreFoundation 0x184651c74 __CFRunLoopServiceMachPort + 196
3 CoreFoundation 0x18464f840 __CFRunLoopRun + 1424
4 CoreFoundation 0x18456ffb8 CFRunLoopRunSpecific + 436
5 Foundation 0x184f996e4 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 304
6 Foundation 0x184fb8afc -[NSRunLoop(NSRunLoop) runUntilDate:] + 96
7 UIKit 0x18e6a32f4 -[UIEventFetcher threadMain] + 136
8 Foundation 0x18509a860 NSThread__start + 996
9 libsystem_pthread.dylib 0x1842d431c _pthread_body + 308
10 libsystem_pthread.dylib 0x1842d41e8 _pthread_body + 310
11 libsystem_pthread.dylib 0x1842d2c28 thread_start + 4

#3. com.twitter.crashlytics.ios.MachExceptionServer
0 gameName 0x10129877c CLSProcessRecordAllThreads + 9060700
1 gameName 0x10129877c CLSProcessRecordAllThreads + 9060700
2 gameName 0x101298638 CLSProcessRecordAllThreads + 9060376
3 gameName 0x101288388 CLSHandler + 8994152
4 gameName 0x10128339c CLSMachExceptionServer + 8973692
5 libsystem_pthread.dylib 0x1842d431c _pthread_body + 308
6 libsystem_pthread.dylib 0x1842d41e8 _pthread_body + 310
7 libsystem_pthread.dylib 0x1842d2c28 thread_start + 4

#4. com.apple.NSURLConnectionLoader
0 libsystem_kernel.dylib 0x1841a0bc4 mach_msg_trap + 8
1 libsystem_kernel.dylib 0x1841a0a3c mach_msg + 72
2 CoreFoundation 0x184651c74 __CFRunLoopServiceMachPort + 196
3 CoreFoundation 0x18464f840 __CFRunLoopRun + 1424
4 CoreFoundation 0x18456ffb8 CFRunLoopRunSpecific + 436
5 CFNetwork 0x184cda264 +[NSURLConnection(Loader) _resourceLoadLoop:] + 404
6 Foundation 0x18509a860 NSThread__start + 996
7 libsystem_pthread.dylib 0x1842d431c _pthread_body + 308
8 libsystem_pthread.dylib 0x1842d41e8 _pthread_body + 310
9 libsystem_pthread.dylib 0x1842d2c28 thread_start + 4

#5. Thread
0 libsystem_kernel.dylib 0x1841c1150 __psynch_cvwait + 8
1 libsystem_pthread.dylib 0x1842d6d30 _pthread_cond_wait$VARIANT$mp + 640
2 libc++.1.dylib 0x18387bea4 std::__1::condition_variable::wait(std::__1::unique_lockstd::__1::mutex&) + 24
3 gameName 0x10114f158 cocos2d::TextureCache::loadImage() + 7711544
4 gameName 0x101151480 void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_deletestd::__1::__thread_struct >, void (cocos2d::TextureCache::)(), cocos2d::TextureCache> >(void*) + 7720544
5 libsystem_pthread.dylib 0x1842d431c _pthread_body + 308
6 libsystem_pthread.dylib 0x1842d41e8 _pthread_body + 310
7 libsystem_pthread.dylib 0x1842d2c28 thread_start + 4

#6. Thread
0 libsystem_kernel.dylib 0x1841c1150 __psynch_cvwait + 8
1 libsystem_pthread.dylib 0x1842d6d30 _pthread_cond_wait$VARIANT$mp + 640
2 libc++.1.dylib 0x18387bea4 std::__1::condition_variable::wait(std::__1::unique_lockstd::__1::mutex&) + 24
3 gameName 0x1010fd264 void std::__1::condition_variable_any::waitstd::__1::mutex(std::__1::mutex&) + 7375940
4 gameName 0x1010fd108 cocos2d::network::HttpClient::networkThread() + 7375592
5 gameName 0x1010ffff8 void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_deletestd::__1::__thread_struct >, std::__1::__bind<void (cocos2d::network::HttpClient::)(), cocos2d::network::HttpClient> > >(void*) + 7387608
6 libsystem_pthread.dylib 0x1842d431c _pthread_body + 308
7 libsystem_pthread.dylib 0x1842d41e8 _pthread_body + 310
8 libsystem_pthread.dylib 0x1842d2c28 thread_start + 4

#7. AVAudioSession Notify Thread
0 libsystem_kernel.dylib 0x1841a0bc4 mach_msg_trap + 8
1 libsystem_kernel.dylib 0x1841a0a3c mach_msg + 72
2 CoreFoundation 0x184651c74 __CFRunLoopServiceMachPort + 196
3 CoreFoundation 0x18464f840 __CFRunLoopRun + 1424
4 CoreFoundation 0x18456ffb8 CFRunLoopRunSpecific + 436
5 AVFAudio 0x189e58774 GenericRunLoopThread::Entry(void*) + 164
6 AVFAudio 0x189e83018 CAPThread::Entry(CAPThread*) + 84
7 libsystem_pthread.dylib 0x1842d431c _pthread_body + 308
8 libsystem_pthread.dylib 0x1842d41e8 _pthread_body + 310
9 libsystem_pthread.dylib 0x1842d2c28 thread_start + 4

#8. Thread
0 libsystem_kernel.dylib 0x1841c1dbc __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x1842d2fa0 _pthread_wqthread + 884
2 libsystem_pthread.dylib 0x1842d2c20 start_wqthread + 4

#9. Thread
0 libsystem_kernel.dylib 0x1841c1dbc __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x1842d2fa0 _pthread_wqthread + 884
2 libsystem_pthread.dylib 0x1842d2c20 start_wqthread + 4

#10. Thread
0 libsystem_kernel.dylib 0x1841c1150 __psynch_cvwait + 8
1 libsystem_pthread.dylib 0x1842d6d30 _pthread_cond_wait$VARIANT$mp + 640
2 libc++.1.dylib 0x18387bf34 std::__1::condition_variable::__do_timed_wait(std::__1::unique_lockstd::__1::mutex&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) + 96
3 gameName 0x10118a3e4 std::__1::cv_status std::__1::condition_variable::wait_for<long long, std::__1::ratio<1l, 1000l> >(std::__1::unique_lockstd::__1::mutex&, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000l> > const&) + 7953860
4 gameName 0x10118a110 cocos2d::experimental::AudioPlayer::rotateBufferThread(int) + 7953136
5 gameName 0x10118a544 void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_deletestd::__1::__thread_struct >, void (cocos2d::experimental::AudioPlayer::)(int), cocos2d::experimental::AudioPlayer, unsigned int> >(void*) + 7954212
6 libsystem_pthread.dylib 0x1842d431c _pthread_body + 308
7 libsystem_pthread.dylib 0x1842d41e8 _pthread_body + 310
8 libsystem_pthread.dylib 0x1842d2c28 thread_start + 4

#11. Thread
0 libsystem_kernel.dylib 0x1841c1dbc __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x1842d2fa0 _pthread_wqthread + 884
2 libsystem_pthread.dylib 0x1842d2c20 start_wqthread + 4

#12. Thread
0 libsystem_kernel.dylib 0x1841c1dbc __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x1842d2fa0 _pthread_wqthread + 884
2 libsystem_pthread.dylib 0x1842d2c20 start_wqthread + 4

#13. Crashed: com.apple.root.default-qos
0 libclosured.dylib 0x1c4c2af60 (Missing)
1 libdispatch.dylib 0x18402d088 _dispatch_call_block_and_release + 24
2 libdispatch.dylib 0x18402d048 _dispatch_client_callout + 16
3 libdispatch.dylib 0x184034090 _dispatch_queue_override_invoke$VARIANT$mp + 716
4 libdispatch.dylib 0x18403a1c8 _dispatch_root_queue_drain + 596
5 libdispatch.dylib 0x184039f10 _dispatch_worker_thread3 + 120
6 libsystem_pthread.dylib 0x1842d3120 _pthread_wqthread + 1268
7 libsystem_pthread.dylib 0x1842d2c20 start_wqthread + 4