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如何更正此问题以便我的MySQL代码正常工作.

这是我的MySQL代码,它给了我这个问题.

$q = "UPDATE users INNER JOIN contact_info ON contact_info.user_id = users.user_id SET active.users = NULL WHERE (email.contact_info = '" . mysqli_real_escape_string($mysqli, $x) . "' AND active.users = '" . mysqli_real_escape_string($mysqli, $y) . "') LIMIT 1";
$r = mysqli_query ($mysqli, $q) or trigger_error("Query: $q\n<br />MySQL Error: " . mysqli_error($mysqli));