PHP Error in http.php

Hi there
This morning I noticed an error in the error log which read

PHP Warning: parse_url() expects parameter 1 to be string, array given in /home/*****/public_html/*******.com/wp-includes/http.php on line 612

Not sure what this is about. Here is the line the error is on
$arrURL = parse_url($url);

Any idea what I can do fix it?