注册环信消息监听报空指针

我使用的是sdk3.3.6,项目要接收透传消息,在Application类里面注册环信消息接收的监听,我是使用leakcanary检测项目,时不时会报空指针异常,下面的是错误日志和代码截图!
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'com.hyphenate.chat.adapter.EMAChatManager com.hyphenate.chat.adapter.EMAChatClient.getChatManager()' on a null object reference