iOS 最新SDK 有时收到消息推送会出现闪退问题

* thread #29, name = 'ConversationTaskQueue', stop reason = signal SIGABRT

  * frame #0: 0x000000018197d014 libsystem_kernel.dylib`__pthread_kill + 8

    frame #1: 0x0000000181a47264 libsystem_pthread.dylib`pthread_kill + 112

    frame #2: 0x00000001818f19c4 libsystem_c.dylib`abort + 140

    frame #3: 0x00000001813bd1b0 libc++abi.dylib`abort_message + 132

    frame #4: 0x00000001813d6c04 libc++abi.dylib`default_terminate_handler() + 304

    frame #5: 0x00000001813e4830 libobjc.A.dylib`_objc_terminate() + 140

    frame #6: 0x00000001813d35d4 libc++abi.dylib`std::__terminate(void (*)()) + 16

    frame #7: 0x00000001813d2ef8 libc++abi.dylib`__cxa_throw + 136

    frame #8: 0x0000000101954ec4 libglInterpose.dylib`operator new(unsigned long) + 68

    frame #9: 0x00000001813a1ef0 libc++.1.dylib`std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::__init(char const*, unsigned long) + 72

    frame #10: 0x00000001813a1f80 libc++.1.dylib`std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::basic_string(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) + 68

    frame #11: 0x0000000101be0ac0 Hyphenate`easemob::EMAttributeValue::EMAttributeValue(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) + 12

    frame #12: 0x0000000101b903f8 Hyphenate`easemob::EMDatabase::updateConversationExt(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) + 276

    frame #13: 0x0000000101b89b9c Hyphenate`std::__1::__function::__func<easemob::EMConversationPrivate::setExtField(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&)::$_2, std::__1::allocator<easemob::EMConversationPrivate::setExtField(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&)::$_2>, void ()>::operator()() + 36

    frame #14: 0x0000000101bdd5d0 Hyphenate`easemob::EMTaskQueue::EMTaskQueueThread::main() + 248

    frame #15: 0x0000000101bddeec Hyphenate`std::__1::__thread_proxy<std::__1::tuple<easemob::EMTaskQueue::EMTaskQueueThread::EMTaskQueueThread(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&)::$_1> >(void*, void*) + 108

    frame #16: 0x0000000181a4568c libsystem_pthread.dylib`_pthread_body + 240

    frame #17: 0x0000000181a4559c libsystem_pthread.dylib`_pthread_start + 284

    frame #18: 0x0000000181a42cb4 libsystem_pthread.dylib`thread_start + 4