wp_list_categories() php warning

  • When I use wp_list_categories() I get this PHP warning (one time for each category i have)

    Warning: mysql_real_escape_string() expects parameter 1 to be string, object given in /home/qs/public_html/wp-includes/wp-db.php on line 789

    After that, the categories are listed as normal.
    I have tried overwriting all the wordpress files on my server with a fresh set.

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