Error with wordpress plugin updating to PHP 7.4

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PHP

plugin

WordPress

Hey guys I would extremely appreciate it if someone can help me out with an issue I am having on my Wordpress website after updating to PHP 7.4 (I am not that tech-savvy)

I thought it would be a good idea to update to PHP 7.4 from 7.1 for security reasons, before the update I ensured that all of my plug-ins were updated and my Wordpress was running the latest version.

After the update everything was smooth except for one small section on my home screen.

Imgur: The magic of the Internet[^]

I believe I know the plugin used for this section, it is WPBakery and I do not have the license for it so it is running on version 6.1

I also have the code stating where the problem is: (line 817)

//Process Box
add_shortcode('process', 'process_func');
function process_func($atts, $content = null){
    extract(shortcode_atts(array(
        'shadow'     =>  '',    
        'number'     =>  '',    
        'title'      =>  '',     
        'image'      =>  '',   
        'style'      =>  'style1',   
    ), $atts));
    $img = wp_get_attachment_image_src($image,'full');
    $img = $img[0];
    ob_start(); 
?>

This is what the section of the website looks like in PHP Version 7.2

Imgur: The magic of the Internet[^]

If someone understands the issue here and can explain it I would really appreciate the help! Also let me know if you need more information or context and I will provide it.

What I have tried:

I am not sure how to fix this.