Comment 1 for bug 939059

Thank you for reporting the bug, I have had the same issue when using Peardrop with lighttpd on my ARM5 device.
You can suppress this error by changing the error reporting in the global config to '0'

Change line:
error_reporting(E_ALL);
 to
error_reporting(0);
in to /config/error-reporting.php

If you are using a snapshot or a version where this file does not exsist,
Simple insert the above line in /config/vars.inc.php and that should suppress any warnings.