Can't Delete Multiple Games – ERROR

Hello…
I am trying to delete some duplicate games, but get the following error:
Warning: Invalid argument supplied for foreach() in /home/slagh500/public_html/waterfordslopitch.ca/wp-content/plugins/leaguemanager/admin/show-league.php on line 58

You can see the duplicate for July 31, 2013 at the following URL: http://www.waterfordslopitch.ca/?page_id=21

Can anyone suggest a fix?

http://ww.wp.xz.cn/extend/plugins/leaguemanager/