I did a little research and found that when cron jobs run on my server, bad behavior creates a log entry with a NULL IP address.
On line 178 of bad-behavior-wordpress-admin.php, the code looks like this:
$host = gethostbyaddr($result["ip"]);
If the developer wouldn’t mind, he/she should check for NULL or check to see if the string has digits before calling gethostbyaddr().
Meanwhile, does anyone know how to tell BH to ignore my cron jobs?