Menu router table errors thrown on update.php page

Once I select the modules to update the progress bar screen comes up, which displays these errors. And since this screen keeps being displayed with JS updates, these errors are visible throughout the update process.

# user warning: 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 ') ORDER BY fit DESC LIMIT 0, 1' at line 1 query: SELECT * FROM menu_router WHERE path IN () ORDER BY fit DESC LIMIT 0, 1 in /var/www/libikoka.weblabor.hu/root/includes/menu.inc on line 286.
# user warning: 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 ') ORDER BY fit DESC LIMIT 0, 1' at line 1 query: SELECT * FROM menu_router WHERE path IN () ORDER BY fit DESC LIMIT 0, 1 in /var/www/libikoka.weblabor.hu/root/includes/menu.inc on line 286.

What's interesting is that the IN part has an empty list, so this seems like an erroneous call.