number_format(): Passing null to parameter #1 ($num) of type float is deprecated

line # FECES_ERROR_HANDLER('8192','number_format(): Passing null to parameter #1 ($num) of type float is deprecated','/home/puke7/botb/whats/tournament/tournament_class.php','24');

line #24 number_format('','3');
/home/puke7/botb/whats/tournament/tournament_class.php

line #319 tournament::generate_run_stats(array);
/home/puke7/botb/whats/arena/arena.php

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