my FunFacts app is repeatedly crashing ....help?

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_funfactsactivity);

    mFactTextView = (TextView) findViewById(R.id.factTextView);
    mShowFactButton = (Button) findViewById(R.id.showFactButton);


    View.OnClickListener listener = new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            String[] facts = {
                       "Ants stretch when they wake up in the morning.",
                        "Ostriches can run faster than horses.",
                        "Olympic gold medals are actually made mostly of silver.",
                        "You are born with 300 bones; by the time you are an adult you will have 206.",
                        "It takes about 8 minutes for light from the Sun to reach Earth.",
                        "Some bamboo plants can grow almost a meter in just one day.",
                        "The state of Florida is bigger than England.",
                        "Some penguins can leap 2-3 meters out of the water.",
                        "On average, it takes 66 days to form a new habit.",
                        "Mammoths still walked the earth when the Great Pyramid was being built"
                                };
            String fact = "";
            Random randomGenerator = new Random();
            int randomNumber = randomGenerator.nextInt(facts.length);
            fact = facts[randomNumber];


            mFactTextView.setText(fact);
        }
    };
    mShowFactButton.setOnClickListener(listener);
    // ATTENTION: This was auto-generated to implement the App Indexing API.
    // See https://g.co/AppIndexing/AndroidStudio for more information.
    mClient = new GoogleApiClient.Builder(this).addApi(AppIndex.API).build();
}