Fatal error: Uncaught TypeError: Table::findBy(): Argument #2 ($value) must be of type string, null given, called in /var/www/vhosts/asada-shinkyu.jp/www.asada-shinkyu.jp/public_html/wp-content/themes/iyashi/includes/discovering-data/disease-and-symptom.php on line 9 and defined in /var/www/vhosts/asada-shinkyu.jp/www.asada-shinkyu.jp/public_html/wp-content/plugins/iatrism-database-connection/classes/Tables/Table.php:88 Stack trace: #0 /var/www/vhosts/asada-shinkyu.jp/www.asada-shinkyu.jp/public_html/wp-content/themes/iyashi/includes/discovering-data/disease-and-symptom.php(9): Table->findBy() #1 /var/www/vhosts/asada-shinkyu.jp/www.asada-shinkyu.jp/public_html/wp-content/themes/iyashi/discovering-data.php(48): include('...') #2 /var/www/vhosts/asada-shinkyu.jp/www.asada-shinkyu.jp/public_html/wp-includes/template-loader.php(106): include('...') #3 /var/www/vhosts/asada-shinkyu.jp/www.asada-shinkyu.jp/public_html/wp-blog-header.php(19): require_once('...') #4 /var/www/vhosts/asada-shinkyu.jp/www.asada-shinkyu.jp/public_html/index.php(17): require('...') #5 {main} thrown in /var/www/vhosts/asada-shinkyu.jp/www.asada-shinkyu.jp/public_html/wp-content/plugins/iatrism-database-connection/classes/Tables/Table.php on line 88