midra on "PHP Error in wp-db.php on line 1127"

Hi

I have installed a wordpress 3.5.2 with SQL Server as database. It works rather good except from that there are a errormessage that are displayed almost whenever I try to click on anything in the system.

The error message is:
PHP Warning: mysql_free_result(): supplied resource is not a valid MySQL result resource in C:\inetpub\wwwroot\wordpress\wp-includes\wp-db.php on line 1127

If I press refresh after the error message it continuo with no problem.

I located the code in wp-db.php and commented out line 1126 and 1127 and then it works fine.

Anyone that have any idea?