malformed amazon filter entries result in errors

Using just amazon <asin> in the brackets gets:
Warning: Query was empty query: in /home/martin/public_html/includes/database.mysql.inc on line 120

Using amazon info <asin> gets:

Warning: implode(): Bad arguments. in /home/martin/public_html/sites/www.hyperlogos.org/modules/amazon_filter/amazon_filter.module on line 78

Using amazon:<asin> puts the text (with brackets) in the node body, the filter does not match it. At least this is expected.

Using amazon title <asin> results in the product name showing up where the token was, but it's a link back to my site (literally an anchor with href="/").

Using amazon cover <asin> results in an empty anchor (with closing) which links to my site URL.

This module does not work here. Is it supposed to link to an amazon_node node? or perhaps an amazon node? Will it not work if I don't already have them created on my system? That sounds fishy, since I can do amazon title <asin> and it will spit out the name of the product when I have not manually created anything relating to that ASIN. But if it is, then the documentation needs substantial revision to indicate that you must manually create amazon_node nodes (or what have you) before you can use this filter.