Trailing space added to exceptions in variable table

The module's been working fine, but I needed to add a number of exceptions for APIs requiring oauth, particularly Mollom, Mailchimp and Twitter. However, I found I could only get one of these services working at any one time. Looking at the variable table, I could see that for each of the entries in proxy_exception, an additional trailing space was being added - eg "rest.mollom.com ". This was true of every line in the Exceptions form field apart from the last one - which was the one that would work, eg "rest.mollom.com" with no trailing space.

My coding knowledge is pretty minimal so I have no idea if this is the root of the problem, but thought I would report here anyway. I worked around by adding exceptions directly to settings.php