Warning: Undefined array key "merken" in /var/www/vhosts/stadtgeschichte-muenchen.de/httpdocs/literatur/d_literatur.php on line 13
Warning: Undefined variable $sql in /var/www/vhosts/stadtgeschichte-muenchen.de/httpdocs/literatur/d_literatur.php on line 54
Fatal error: Uncaught ValueError: mysqli::query(): Argument #1 ($query) cannot be empty in /var/www/vhosts/stadtgeschichte-muenchen.de/httpdocs/literatur/d_literatur.php:54
Stack trace:
#0 /var/www/vhosts/stadtgeschichte-muenchen.de/httpdocs/literatur/d_literatur.php(54): mysqli->query()
#1 {main}
thrown in /var/www/vhosts/stadtgeschichte-muenchen.de/httpdocs/literatur/d_literatur.php on line 54