Warning: Undefined array key "err" in /customers/a/e/7/xn--frordbogen-15a.dk/httpd.www/inc/db_connect.php on line 8

Warning: Undefined array key "err" in /customers/a/e/7/xn--frordbogen-15a.dk/httpd.www/inc/db_connect.php on line 13
<br><br> QUERY :: 'SELECT `ip`, `timestamp`, `word`, `meaning`, `user_id`, `username` FROM `words`, `users` WHERE `users`.`id`=`user_id` AND `words`.`active`=1 ORDER BY `word` ASC;'<br><br>
Warning: Undefined array key "link" in /customers/a/e/7/xn--frordbogen-15a.dk/httpd.www/inc/db_functions.php on line 8

Fatal error: Uncaught TypeError: mysqli_query(): Argument #1 ($mysql) must be of type mysqli, null given in /customers/a/e/7/xn--frordbogen-15a.dk/httpd.www/inc/db_functions.php:8
Stack trace:
#0 /customers/a/e/7/xn--frordbogen-15a.dk/httpd.www/inc/db_functions.php(8): mysqli_query(NULL, 'SELECT `ip`, `t...')
#1 /customers/a/e/7/xn--frordbogen-15a.dk/httpd.www/single.php(17): exec_sql('SELECT `ip`, `t...')
#2 /customers/a/e/7/xn--frordbogen-15a.dk/httpd.www/index.php(44): require_once('/customers/a/e/...')
#3 /customers/a/e/7/xn--frordbogen-15a.dk/httpd.www/index.php(49): findPage()
#4 {main}
  thrown in /customers/a/e/7/xn--frordbogen-15a.dk/httpd.www/inc/db_functions.php on line 8