Start controller if module exist?

How can i check in the controller if a module exist?

If i remove my module, i will get an error.

Cheers, Maarten

To acces my module from the controller .

$formbuilder = $page->children()->filterBy('template', 'module.formbuilder')->first();
}

My Module

My controller

<?php

return function($site, $pages, $page) {
    
$formbuilder = $page->children()->filterBy('template', 'module.formbuilder')->first();
    
    
    
    $form = uniform('contact-form', [
        'required' => [
            'name'   => '',
            'tel'   => '',
            'message'   => '',
            '_from'  => 'email'
        ],
        'validate' => [
            'tel' => 'num'
        ],
        'actions' => [
            [
                '_action' => 'email',
                'to'      => $formbuilder->to(),
                'sender'  => $formbuilder->send(),
                'subject' => $formbuilder->subject() . '                 {date}',
                'snippet' => 'uniform-email-contact'
                
            ],
                        [
               '_action' => 'email', 
               'sender'  => $formbuilder->send(),
               'subject' => 'Thank You For Contacting Us, {name}!',
               'to' => get('_from'),
               'message' => 'Thank you for contacting us today. We will be in touch soon!',
               'snippet' => 'uniform-email-thanks'
                
            ],
            [
'_action' => 'create-page',
'template' => 'client',
'prefix' => 'client-',
'parent' => page('app/contacts'),

]
            
            
        ]
    ]);
     
    return compact('form');

    
};

With the following code:

if($formbuilder) {
  // something
}