カテゴリーを削除したらwarningが出てしまった

カテゴリーを一つ消去したら記事が見れなくなってしまいました。
こんなものが出てきます。どうすればいいでしょうか？

Warning: Undefined array key "category_list" in /home/c9070437/public_html/30konkatu.com/wp-content/themes/jinr/include/custom-functions.php on line 3710
Fatal error: Uncaught TypeError: array_intersect(): Argument #2 must be of type array, null given in /home/c9070437/public_html/30konkatu.com/wp-content/themes/jinr/include/custom-functions.php:3710 Stack trace: #0 /home/c9070437/public_html/30konkatu.com/wp-content/themes/jinr/include/custom-functions.php(3710): array_intersect() #1 /home/c9070437/public_html/30konkatu.com/wp-includes/class-wp-hook.php(308): jinr_h2_ads_concert() #2 /home/c9070437/public_html/30konkatu.com/wp-includes/plugin.php(205): WP_Hook->apply_filters() #3 /home/c9070437/public_html/30konkatu.com/wp-includes/post-template.php(255): apply_filters() #4 /home/c9070437/public_html/30konkatu.com/wp-content/themes/jinr/single.php(97): the_content() #5 /home/c9070437/public_html/30konkatu.com/wp-includes/template-loader.php(106): include('/home/c9070437/...') #6 /home/c9070437/public_html/30konkatu.com/wp-blog-header.php(19): require_once('/home/c9070437/...') #7 /home/c9070437/public_html/30konkatu.com/index.php(17): require('/home/c9070437/...') #8 {main} thrown in /home/c9070437/public_html/30konkatu.com/wp-content/themes/jinr/include/custom-functions.php on line 3710