There has been a critical error on this website.

Hello,

Everything was fine until I created this block

<div class="cat_container primo_cat">
<?php
    $args = array(
        'post_type' => 'post',
        'posts_per_page' => 6
    );

    $post_query = new WP_Query($args);

    if($post_query->have_posts() ) {
        while($post_query->have_posts() ) {
            $post_query->the_post();
            ?>
            <?php $color_cat = the_category_ID($echo = false); ?>
            <div class="catalogue_item">
                <div class="catalogue_item_img">
                    <a href="<?php echo get_permalink(); ?>"><?php the_post_thumbnail('medium'); ?></a>
                </div>
                <div class="catalogue_item_txt">
                    <h2><a href="<?php echo get_permalink(); ?>"><?php echo wp_html_excerpt( get_the_title(), 35, '...'); ?></a></h2>
                    <p class="catalogue_excerpt"><?php echo wp_html_excerpt( get_the_excerpt(), 75, '...'.'<a href="'. get_permalink() . '">[lire la suite]</a>');?></p>
                    <p class="catalogue_item_price"> Prix: <?php echo (types_render_field( 'price', array() ));?> € </p>
                </div>
                <p class="catalogue_item_cat" style="background-color: <?php  echo get_term_meta( $color_cat, 'cat_color', true ); ?>;">
                    <?php foreach ( ( get_the_category() ) as $category ) {
                        echo $category->cat_name . ' ';
                    }?>
                </p>
            </div>
            <?php
            }
        }
?>
</div>
<div class="btn btn-three dark" style="margin: 20px auto;">
    <span>
        <a href="<?php echo get_site_url();?>/catalogue"><?php echo $attributes['bouton-de-la-galerie']; ?></a>
    </span>
</div>

Then, it shows correctly on my website but when I try to access the page in the admin i get this:
There has been a critical error on this website. Please check your site admin email inbox for instructions.

Is there something wrong in my block or some other way I should be doing this ?

Thanks