Fatal error: Uncaught mysqli_sql_exception: Incorrect DATE value: '' in /home/mathweb/public_html/backoffice/tools/db/func_db.php:144 Stack trace: #0 /home/mathweb/public_html/backoffice/tools/db/func_db.php(144): mysqli_query(Object(mysqli), 'SELECT * FROM `...') #1 /home/mathweb/public_html/mobile/02_lecture_list.php(45): db_query('SELECT * FROM `...') #2 {main} thrown in /home/mathweb/public_html/backoffice/tools/db/func_db.php on line 144