Completed Signup Form Forwarding Error

When a user starts from an event info page, signs up to volunteer for needs associated only with that one event, they should be forwarded back to the info page after completing the signup form. However, the setDestination function attemps to use the current index of the projects array to fetch a project's associated entity_id. The project pointer seems to already be at the end of the array, so current() returns false.

The user is forwarded to 'civicrm/event/info?id=' and is then shown the following error.

Sorry but we are not able to provide this at the moment.
id (value: ) is not of the type Positive