NullPointerException after clicking "yes, authorize" in the Flickr dialogue

Start at OAuthTokenClient.java line 93, then trace how OAuthBaseClient.authorize and OAuthLoginActionBarActivity.onResume pass the authorization response. Reproduce the Flickr flow with the configured private key and secret, identify the null value involved, and verify that clicking “yes, authorize” no longer raises the exception and completes authorization.

Should the code still work?

I added my private key and secret from Flickr API and tried to test this. I am getting this Exception.

D/LoginActivity: in 'AsyncTask.execute:' run: starts
W/System.err: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.contains(java.lang.CharSequence)' on a null object reference
W/System.err:     at com.codepath.oauth.OAuthTokenClient.fetchAccessToken(OAuthTokenClient.java:93)
        at com.codepath.oauth.OAuthBaseClient.authorize(OAuthBaseClient.java:145)
        at com.codepath.oauth.OAuthLoginActionBarActivity.onResume(OAuthLoginActionBarActivity.java:39)
W/System.err:     at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1456)
        at android.app.Activity.performResume(Activity.java:8135)
        at android.app.ActivityThread.performResumeActivity(ActivityThread.java:4434)
        at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:4476)
        at android.app.servertransaction.ResumeActivityItem.execute(ResumeActivityItem.java:52)
        at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:176)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:97)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2066)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:223)
        at android.app.ActivityThread.main(ActivityThread.java:7656)
        at java.lang.reflect.Method.invoke(Native Method)
W/System.err:     at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)