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Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference	at com.burgstaller.okhttp.digest.DigestAuthenticator.createDigestHeader(DigestAuthenticator.java:289)	at com.burgstaller.okhttp.digest.DigestAuthenticator.authenticateWithState(DigestAuthenticator.java:190)	at com.burgstaller.okhttp.digest.DigestAuthenticator.authenticate(DigestAuthenticator.java:148)	at com.burgstaller.okhttp.DispatchingAuthenticator.authenticate(DispatchingAuthenticator.java:45)	at com.burgstaller.okhttp.CachingAuthenticatorDecorator.authenticate(CachingAuthenticatorDecorator.java:30)	at okhttp3.internal.http.RetryAndFollowUpInterceptor.followUpRequest(RetryAndFollowUpInterceptor.java:283)	at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.java:153)	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:67)	at com.burgstaller.okhttp.AuthenticationCacheInterceptor.intercept(AuthenticationCacheInterceptor.java:37)	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:67)	at com.xxxxxxx.xxxxxxx.singleton.HTTPClient$1.intercept(HTTPClient.java:64)	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:67)	at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:170)	at okhttp3.RealCall.access$100(RealCall.java:33)	at okhttp3.RealCall$AsyncCall.execute(RealCall.java:120)	at okhttp3.internal.NamedRunnable.run(NamedRunnable.java:32)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)	at java.lang.Thread.run(Thread.java:818)