可爱的老师，求助

​next.setOnClickListener(new View.OnClickListener() {
    @Override
    public void  onClick(View v) {
        String num = edtPeople.getText().toString();

        if(TextUtils.isEmpty(num)){
            try{
            Toast.makeText(HomeActivity.this, "请填上数字", Toast.LENGTH_SHORT).show();}
            catch (NumberFormatException e){

            }

        }else{
            Toast.makeText(HomeActivity.this, "成功", Toast.LENGTH_SHORT).show();

        }

    }
});

可爱的老师，请帮我看下为什么EditText为空的时候，程序会崩溃？需要添加什么呢？谢谢你