Fatal error: Uncaught TypeError: array_merge()

I’m getting the following error when trying to preview a productpage:

Warning: Undefined variable $featuredArray in /plugins/wooswipe/wooswipe.php on line 282

Fatal error: Uncaught TypeError: array_merge(): Argument #1 must be of type array, null given in /plugins/wooswipe/wooswipe.php:282 Stack trace: #0 /plugins/wooswipe/wooswipe.php(282): array_merge(NULL, Array) #1 /wp-includes/class-wp-hook.php(307): wooswipe_woocommerce_show_product_thumbnails('') #2 /wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(NULL, Array) #3 /wp-includes/plugin.php(476): WP_Hook->do_action(Array) #4 /plugins/woocommerce/templates/content-single-product.php(43): do_action('woocommerce_bef...') #5 /wp-includes/template.php(772): require('/app/sites/beek...') #6 /plugins/woocommerce/includes/wc-core-functions.php(284): load_template('/app/sites/beek...', false) #7 /plugins/woocommerce/includes/wc-template-functions.php(971): wc_get_template_part('content', 'single-product') #8 /themes/Total/woocommerce.php(33): woocommerce_content() #9 /wp-includes/template-loader.php(106): include('/app/sites/beek...') #10 /wp-blog-header.php(19): require_once('/app/sites/beek...') #11 /index.php(5): require('/app/sites/beek...') #12 {main} thrown in /plugins/wooswipe/wooswipe.php on line 282