救急，提交之前，环信聊天Crash

提交之前，环信聊天报错， 那里越界了吗？？ debug版本，堆栈完全看不出来。。。大神救急！！！

1. libc++abi.dylib: terminate_handler unexpectedly threw an exception
2._NSLayoutTreeGetBaselineOffsetForGlyphAtIndex invalid glyph index 0
 
 
我改了，设置聊天气泡图像， 这里有报警，我注掉后，还是一样crash



    //[[EaseBaseMessageCell appearance] setSendBubbleBackgroundImage:[[UIImage imageNamed:@"chat_sender_bg"] resizableImageWithCapInsets:UIEdgeInsetsMake(22, 20, 10, 20)]];

    

    //[[EaseBaseMessageCell appearance] setRecvBubbleBackgroundImage:[[UIImage imageNamed:@"chat_receiver_bg"] resizableImageWithCapInsets:UIEdgeInsetsMake(22, 20, 10, 20)]];