这个地方崩溃了：-[EMChatManager(Buddy) loadAllBuddiesFromDatabase]

 我们的线上应用（iOS）收集到的崩溃日至里有二十多条这样的纪录（如下）。而且关键是，我们的代码里并没有用到Buddy这块。请帮忙看一下问题原因是什么，如何解决？
 
SDK版本：2.2.1

Thread : Crashed: com.apple.root.default-qos
0  libobjc.A.dylib                0x1807a1bd0 objc_msgSend + 16
1  Sobrr                          0x10023f174 -[EMChatManager(Buddy) loadAllBuddiesFromDatabase] (EMChatManager+Buddy.m:591)
2  Sobrr                          0x10022ace8 -[EMChatManager(Login) _loginFinishedWithUsername:error:] (EMChatManager+Login.m:453)
3  Sobrr                          0x10022b398 -[EMChatManager(Login) loginWithUsername:password:error:] (EMChatManager+Login.m:674)
4  Sobrr                          0x10022bc0c __56-[EMChatManager(Login) asyncLoginWithUsername:password:]_block_invoke (EMChatManager+Login.m:710)
5  libdispatch.dylib              0x180b75630 _dispatch_call_block_and_release + 24
6  libdispatch.dylib              0x180b755f0 _dispatch_client_callout + 16
7  libdispatch.dylib              0x180b83a88 _dispatch_root_queue_drain + 2140
8  libdispatch.dylib              0x180b83224 _dispatch_worker_thread3 + 112
9  libsystem_pthread.dylib        0x180d89470 _pthread_wqthread + 1092
10 libsystem_pthread.dylib        0x180d89020 start_wqthread + 4

（详细的Crash信息：http://crashes.to/s/ef0bd411e7a  ，貌似要翻墙）