Deprecated: htmlspecialchars(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/modules/mod_flipbookmaster/mod_flipbookmaster.php on line 20

Deprecated: htmlspecialchars(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/modules/mod_flipbookmaster/mod_flipbookmaster.php on line 26