Broken site after v1.8.5.3 update

Hello,

I updated the plugin today (v1.8.4 to v1.8.5.3), and now my website is broken. I suspect this is related to your recent changes concerning esc_attr and esc_html for XSS injection vulnerability compliance.

However, my code is very straightforward and has been working perfectly until now. Here it is:

function ninjaForm( $args = array(), $content="" ) {    
    if ( is_singular() ) {
        $sendEmail = do_shortcode('[expand title="Send e-mail" trigclass="envoimail" swaptitle="Reduce" targpos="inline"][gd_ninja_forms form_id="5" text="Contact Form" post_contact="1" output="form"][/expand]');
        return $sendEmail;
    }
}
add_shortcode( 'ninjaForm', 'ninjaForm' );

Could you please let me know what I should modify?
Thank you in advance for your help.