[Plugin: LeagueManager] Can't add or edit matches, SQL error messages on every function

I’m getting very disturbing error messages in the League Manager after updating to the last release today. I’m unable to add new matches to tournaments that I added after the upgrade. When I try, I get this error message:

Warning: Invalid argument supplied for foreach() in /home/baba/public_html/wp-content/plugins/leaguemanager/admin/show-league.php on line 22

I also get two other error messages when adding games to tournaments that are already in the system before I upgraded.

Warning: mysql_real_escape_string() expects parameter 1 to be string, array given in /home/baba/public_html/wp-includes/wp-db.php on line 785
(which was repeated four times)

and

WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1]
SELECT <code>custom</code> FROM wp_leaguemanager_matches WHERE <code>id</code> =

Warning: mysql_real_escape_string() expects parameter 1 to be string, array given in /home/baba/public_html/wp-includes/wp-db.php on line 785
WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1]
SELECT <code>custom</code> FROM wp_leaguemanager_matches WHERE <code>id</code> =

Warning: mysql_real_escape_string() expects parameter 1 to be string, array given in /home/baba/public_html/wp-includes/wp-db.php on line 785
WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1]
SELECT <code>custom</code> FROM wp_leaguemanager_matches WHERE <code>id</code> =

Warning: mysql_real_escape_string() expects parameter 1 to be string, array given in /home/baba/public_html/wp-includes/wp-db.php on line 785
WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1]
SELECT <code>custom</code> FROM wp_leaguemanager_matches WHERE <code>id</code> =

Warning: mysql_real_escape_string() expects parameter 1 to be string, array given in /home/baba/public_html/wp-includes/wp-db.php on line 785

We are using Baseball, one-point rule, championship (because we have pool play and bracket play). It was working before this upgrade, although the format doesn’t really match our single-elimination bracket play.

Thanks!
Karen