urlencode(): Passing null to parameter #1 ($string) of type string is deprecated

line #     FECES_ERROR_HANDLER('8192','urlencode(): Passing null to parameter #1 ($string) of type string is deprecated','/home/puke7/botb/whats/lyceum/lyceum_article_class.php','12');

line #12     urlencode('');
/home/puke7/botb/whats/lyceum/lyceum_article_class.php

line #191     lyceum_article::Pop('0');
/home/puke7/botb/kernel/_STACKMEM.php

line #181     STACK::FetchObject('lyceum_article','0');
/home/puke7/botb/kernel/_STACKMEM.php

line #134     STACK::Fetch('lyceum_article','0');
/home/puke7/botb/whats/lyceum/lyceum.php

line #30     require_once('/home/puke7/botb/whats/lyceum/lyceum.php');
/home/puke7/botb/_FECES.php