PHP warning when trying to choose categories

I installed this module, went to the settings page to enable both vocabs on my site, then to the browser page.
I selected a few terms from both vocabs and pressed Search.
Got this error message:

    * warning: implode() [function.implode]: Bad arguments. in D:\xampp\htdocs\drupal-staging\sites\all\modules\taxonomy_browser\taxonomy_browser.module on line 381.
    * No posts match your criteria.

This happens whenever I select more than one term.

When I select only one term, I get some actual nodes, but also these warnings:

    * warning: implode() [function.implode]: Bad arguments. in D:\xampp\htdocs\drupal-staging\sites\all\modules\taxonomy_browser\taxonomy_browser.module on line 381.
    * warning: array_filter() [function.array-filter]: The first argument should be an array in D:\xampp\htdocs\drupal-staging\sites\all\modules\taxonomy_browser\taxonomy_browser.module on line 398.
    * warning: implode() [function.implode]: Bad arguments. in D:\xampp\htdocs\drupal-staging\sites\all\modules\taxonomy_browser\taxonomy_browser.module on line 399.