java - Firebase Crash and Throws Null Pointer exception -

i using firebase client android in project , last 4 days throws random nullpointerexception while connecting firebase.

here stacktrace have found on bugsense:

java.lang.nullpointerexception 1at com.firebase.tubesock.websockethandshake.verifyserverhandshakeheaders(websockethandshake.java:95) 2at com.firebase.tubesock.websocket.run(websocket.java:147) 

thanks in advance in regard