gamipress_earnings and points_type

When using the gamipress_earnings shortcode and specifying a points_types attribute, the query generated is automatically including a blank (”) points_type, which means inapplicable results are returned. In other words, while my query should look like this:

SELECT SQL_CALC_FOUND_ROWS prefix_gamipress_user_earnings.user_earning_id
FROM prefix_gamipress_user_earnings
WHERE 1=1 AND prefix_gamipress_user_earnings.user_id = 100
AND prefix_gamipress_user_earnings.points_type IN ( 'super-points' )

it instead looks like this:

SELECT SQL_CALC_FOUND_ROWS prefix_gamipress_user_earnings.user_earning_id
FROM prefix_gamipress_user_earnings
WHERE 1=1 AND prefix_gamipress_user_earnings.user_id = 100
AND prefix_gamipress_user_earnings.points_type IN ( 'super-points', '' )