Exclude errors

Hi, I have activate your plugin and I started receiving thousands of messages about this issue:

Error Level: E_WARNING
Message: is_readable(): open_basedir restriction in effect. File(/dev/urandom) is not within the allowed path(s): (/home/username:/usr/lib/php:/usr/php4/lib/php:/usr/local/lib/php:/usr/local/php4/lib/php:/tmp)
File: /home/username/public_html/wp-includes/class-phpass.php
Line: 68

It’s a core WordPress file, not modified, so this warning seems not useful as the function is simply checking if a server file is readable (and clearly is not readable on every single shared hosting).
Is there a way to stop repeated errors from sending emails or are you thinking providing some way to exclude an error from notifications?