PHP Notice: Object of class WP_Error could not be converted to int in /var/www/vhosts/hayhauler.co/httpdocs/wp-includes/functions.php on line 2568, referer: http://hayhauler.co/

我甚至不知道从哪里开始，也不知道该问什么问题。我知道这会阻止我使用以下方法将某些信息发布到数据库中：

$wpdb->query($wpdb->prepare(
  "
    INSERT INTO $wpdb->quotes
    (user_ID,origin,destination,broker_ID,quote_ID,estimatedship)
    VALUES (%d,%s,%s,%d,%s,%s)
  ",
  $user_id,
  $origin,
  $destination,
  $brokerID,
  $brokerID.\'-\'.genRandomString(),
  $estimatedship
));

然后出现以下错误：

mysql_real_escape_string() expects parameter 1 to be string, object given in /var/www/vhosts/hayhauler.co/httpdocs/wp-includes/wp-db.php on line 789, referer: http://hayhauler.co/

任何帮助或指导都将不胜感激。

<?php
$brokerID = some_function_that_gets_broker_id();

if(is_wp_error($brokerID))
{
    // do stuff to fix it
}
else
{
    // Your original code goes here.
}