Viewing a Rest end point logs me out of Drupal

Hello,

We're using Services with Service Views and Rest. When I visit the end point (domain.com/services/rest/tv) the data is displaying correctly but when I navigate to my other screen I find out I have been logged out of Drupal.

This error is displayed when I refresh Drupal:

Notice: Undefined index: rest_server in services_endpoint_callback() (line 196 of /vhosts/dev.worldviewweekend.com/html/sites/all/modules/contrib/services/services.module).

This happens every time I refresh the endpoint.

Any ideas?

Thanks