调用 cc.game.restart()，发生闪退，以下是日志，看上去是龙骨这块的问题。安卓ios都有发生这个情况。麻烦处理下。
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 libsystem_kernel.dylib 0x00007fff5b6f0e3e __pthread_kill + 10
1 libsystem_pthread.dylib 0x00007fff5b82f150 pthread_kill + 333
2 libsystem_c.dylib 0x00007fff5b64d312 abort + 127
3 libc++abi.dylib 0x00007fff59628f8f abort_message + 245
4 libc++abi.dylib 0x00007fff59645952 __cxa_pure_virtual + 18
5 com.cocos.apps.simulator 0x000000010f9ad3ba dragonBones::BaseObject::returnToPool() + 26
6 com.cocos.apps.simulator 0x000000010f750d0c dragonBones::Slot::_onClear() + 2732
7 com.cocos.apps.simulator 0x000000010f8fc38f dragonBones::CCSlot::_onClear() + 31
8 com.cocos.apps.simulator 0x000000010f9ad3ba dragonBones::BaseObject::returnToPool() + 26
9 com.cocos.apps.simulator 0x000000010f3437c2 dragonBones::Armature::_onClear() + 914
10 com.cocos.apps.simulator 0x000000010f3432b2 dragonBones::Armature::~Armature() + 50
11 com.cocos.apps.simulator 0x000000010f3433b5 dragonBones::Armature::~Armature() + 21
12 com.cocos.apps.simulator 0x000000010f3433f9 dragonBones::Armature::~Armature() + 25
13 com.cocos.apps.simulator 0x000000010f122eb3 register_all_dragonbones_manual(se::Object*)::_1::operator()() const + 867
14 com.cocos.apps.simulator 0x000000010f122b3d void std::__1::__invoke_void_return_wrapper<void>::__call<register_all_dragonbones_manual(se::Object*)::_1&>(register_all_dragonbones_manual(se::Object*)::_1&&&) + 45
15 com.cocos.apps.simulator 0x000000010f122a59 std::__1::__function::__func<register_all_dragonbones_manual(se::Object*)::_1, std::__1::allocator<register_all_dragonbones_manual(se::Object*)::$_1>, void ()>::operator()() + 41
16 com.cocos.apps.simulator 0x000000010f1d181b std::__1::function<void ()>::operator()() const + 123
17 com.cocos.apps.simulator 0x000000010ebf8273 se::ScriptEngine::cleanup() + 2515
18 com.cocos.apps.simulator 0x000000010ede8aa9 ScriptingCore::restartVM() + 25
19 com.cocos.apps.simulator 0x000000010ede89c8 ScriptingCore::sendEvent(cocos2d::ScriptEvent*) + 72
20 com.cocos.apps.simulator 0x000000010f5f67e9 cocos2d::Director::restartDirector() + 153
21 com.cocos.apps.simulator 0x000000010f5f7c41 cocos2d::Director::mainLoop() + 81
22 com.cocos.apps.simulator 0x000000010f9d968d cocos2d::Application::run() + 173