in auth-lib/src/main/java/com/spotify/sdk/android/auth/AuthorizationClient.java [440:450]
private void sendComplete(AuthorizationHandler authHandler, AuthorizationResponse response) {
mAuthorizationPending = false;
closeAuthorizationHandler(authHandler);
if (mAuthorizationClientListener != null) {
mAuthorizationClientListener.onClientComplete(response);
mAuthorizationClientListener = null;
} else {
Log.w(TAG, "Can't deliver the Spotify Auth response. The listener is null");
}
}