Incorrect Links to Taxonomy Term Pages

I'm using Taxonomy List to provide a menu item that shows a page with all terms of one vocabulary: taxonomy/vocabulary/21

The terms are all listed but the Links to the corresponding page for each term don't work. They are all like this:

category/my-vocabulary/drupal/all

which causes an "Page not found"-Error. Without the "all" at the end of the URL it works perfectly. I'm not sure whether this is a bug of Taxonomy List. As an workaround I changed line 107 from

'kids' => variable_get('taxonomy_list_show_children', FALSE) ? '/all' : NULL,

to

'kids' => variable_get('taxonomy_list_show_children', FALSE) ? '/' : NULL,

and the links work fine.