Contact upsert not getting existing contact

When trying to use $contact->upsert() in the latest dev branch it seemed to be having trouble getting an existing contact, and I traced the problem to this line of code:

$existing_contact = redhen_contact_load(key($result['redhen_contact'][0]));

I looks like there is an extra [0], when the key function is being used to get the first element of the $result['redhen_contact'] array.