我也碰见这个问题，开发者没在SDK内做异常判断吧

* thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGABRT
frame #0: 0x00000001843dd2ec libsystem_kernel.dylib`__pthread_kill + 8
frame #1: 0x000000018457e288 libsystem_pthread.dylib`pthread_kill$VARIANT$mp + 376
frame #2: 0x000000018434bd0c libsystem_c.dylib`abort + 140
frame #3: 0x0000000183ae72c8 libc++abi.dylib`abort_message + 132
frame #4: 0x0000000183ae7470 libc++abi.dylib`default_terminate_handler() + 304
frame #5: 0x0000000183b108d4 libobjc.A.dylib`_objc_terminate() + 124
frame #6: 0x0000000183b0137c libc++abi.dylib`std::__terminate(void (*)()) + 16
frame #7: 0x0000000183b00ccc libc++abi.dylib`__cxa_throw + 132
frame #8: 0x0000000183b10720 libobjc.A.dylib`objc_exception_throw + 364
frame #9: 0x00000001848ef750 CoreFoundation`_CFThrowFormattedException + 112
frame #10: 0x000000018481f7f0 CoreFoundation`-[__NSArrayM objectAtIndex:] + 192
frame #11: 0x000000010cc604cc *****`-[BDSSpeechSynthesizer gotPlaybackProgress:isLicenseNotification:] + 260
frame #12: 0x000000010cc5ed90 *****`-[BDSSpeechSynthesizer synthesisCallbackLoop] + 1016
frame #13: 0x000000010d211260 libdispatch.dylib`_dispatch_call_block_and_release + 24
frame #14: 0x000000010d211220 libdispatch.dylib`_dispatch_client_callout + 16
frame #15: 0x000000010d215db0 libdispatch.dylib`_dispatch_main_queue_callback_4CF + 1180
frame #16: 0x00000001848ff070 CoreFoundation`__CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 12
frame #17: 0x00000001848fcbc8 CoreFoundation`__CFRunLoopRun + 2272
frame #18: 0x000000018481cda8 CoreFoundation`CFRunLoopRunSpecific + 552
frame #19: 0x00000001867ff020 GraphicsServices`GSEventRunModal + 100
frame #20: 0x000000018e7fd78c UIKit`UIApplicationMain + 236
* frame #21: 0x00000001049d8c4c ******`main(argc=1, argv=0x000000016b99f838) at main.m:14
frame #22: 0x00000001842adfc0 libdyld.dylib`start + 4
(lldb)