PHP Fatal error

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[12-Jul-2023 13:26:11 UTC] PHP Fatal error:  Uncaught Error: Call to a member function find() on bool in [...]/public_html/wp-content/plugins/sierotki/includes/iworks/class-iworks-orphan.php:417
Stack trace:
[...]/public_html/wp-content/plugins/sierotki/includes/iworks/class-iworks-orphan.php(219): iworks_orphan->unconditional_replacement('\n<h5 class="wp-...')
[...]/public_html/wp-includes/class-wp-hook.php(308): iworks_orphan->replace('\n<h5 class="wp-...')
[...]/public_html/wp-includes/plugin.php(205): WP_Hook->apply_filters('\n<h5 class="wp-...', Array)
#3 [...]/public_html/wp-includes/post-template.php(255): apply_filters('the_content', '<!-- wp:heading...')
#4 [...]/public_html/wp-content/themes/shoptimizer/inc/shoptimizer-template-functions.php(660): the_content()
#5 [...]/public_html/wp-includes/class-wp-hook.php(308): shoptimizer_page_content('')
#6 [...]/public_html/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters('', Array)
#7 [...]/public_html/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#8 [...]/public_html/wp-content/themes/shoptimizer/content-page.php(18): do_action('shoptimizer_pag...')
#9 [...]/public_html/wp-includes/template.php(785): require('/home/allegoryk...')
#10 [...]/public_html/wp-includes/template.php(718): load_template('/home/allegoryk...', false, Array)
#11 [...]/public_html/wp-includes/general-template.php(204): locate_template(Array, true, false, Array)
#12 [...]/public_html/wp-content/themes/shoptimizer/page.php(26): get_template_part('content', 'page')
#13 [...]/public_html/wp-includes/template-loader.php(106): include('/home/allegoryk...')
#14 [...]/public_html/wp-blog-header.php(19): require_once('/home/allegoryk...')
#15 [...]/public_html/index.php(17): require('/home/allegoryk...')
#16 {main}
  thrown in [...]/public_html/wp-content/plugins/sierotki/includes/iworks/class-iworks-orphan.php on line 417

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