Fatal error: Uncaught mysqli_sql_exception: Column 'date' cannot be null in /var/www/html/controller/Database.php:49 Stack trace: #0 /var/www/html/controller/Database.php(49): mysqli_stmt->execute() #1 /var/www/html/controller/Training.php(30): Database->query('INSERT INTO `co...', Array) #2 /var/www/html/public/pages/blog.php(7): Training->add_count('4') #3 {main} thrown in /var/www/html/controller/Database.php on line 49