Table prefixes aren't supported

When installing Drupal you can choose to use a prefix for your tables in the database.
Every time you pass on a query, the prefix will automatically be added to the plain table name by Drupal.
There is one big 'but': in order to support this, you need to add accolades around every table name. When you don't do this, the prefix won't be added to the table names.

If the queries executed at the installation of the module wouldn't support prefixes too, the queries would just work when someone would use a prefix. However, the installation queries do place accolades around the table names, which means the module won't work when a prefix is in use.