MySQL Error: Incorrect usage of UPDATE and LIMIT

Question

How can I correct this problem so that my MySQL code works correctly.

Here is my MySQL code that gives me the problem.

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

Answer 1

As per the MySQL docs for UPDATE:

For the multiple-table syntax, UPDATE updates rows in each table named in table_references that satisfy the conditions. In this case, ORDER BY and LIMIT cannot be used.