Incorrect links in wp-stats.php

i’m using the wp-stats plugin, which works fine, except for one thing.

in the recent-comments listing, the permalinks to a post look fine
– example: https://maanzand.com/piefpoefpfaff/jaloers
but in the recent-posts listing, the category is missing
– example: https://maanzand.com//jaloers

i have no idea what causes this difference. any suggestions?
thanks