Data too long for column 'facet' sql error when saving the facet settings page for an index

I am using the search_api module with facetapi and when I save the facet page for one of my search indexes I get this error:

PDOException: SQLSTATE[22001]: String data, right truncated: 1406 Data too long for column 'facet' at row 1: INSERT INTO {facetapi} (name, searcher, realm, facet, enabled, settings) VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, :db_insert_placeholder_4, :db_insert_placeholder_5); Array ( [:db_insert_placeholder_0] => search_api@contacts:block:profile_background_information:field_contact_addresses:field_contact_address:last_name [:db_insert_placeholder_1] => search_api@contacts [:db_insert_placeholder_2] => block [:db_insert_placeholder_3] => profile_background_information:field_contact_addresses:field_contact_address:last_name [:db_insert_placeholder_4] => 0 [:db_insert_placeholder_5] => a:9:{s:6:"weight";i:0;s:6:"widget";s:14:"facetapi_links";s:7:"filters";a:0:{}s:12:"active_sorts";a:3:{s:6:"active";s:6:"active";s:5:"count";s:5:"count";s:7:"display";s:7:"display";}s:11:"sort_weight";a:3:{s:6:"active";i:-50;s:5:"count";i:-49;s:7:"display";i:-48;}s:10:"sort_order";a:3:{s:6:"active";i:3;s:5:"count";i:3;s:7:"display";i:4;}s:14:"empty_behavior";s:4:"none";s:10:"soft_limit";i:20;s:13:"show_expanded";i:0;} ) in drupal_write_record() (line 6868 of /var/www/mirp/includes/common.inc).

I'm guessing it has to do with the crazyness of what I'm indexing.

I am indexing user accounts, which have profile2 profiles, which have field_collection fields, one of which even has an addressfield in it.
So to have a post code facet I have something like:
Background information profile » Addresses » Address » Postal code
Which has the value profile_background_information:field_contact_addresses:field_contact_address:postal_code
which is 90 characters long.
The field is only varchar (64).

I know this is search_api specific but it could be an issue elsewhere so I'm assuming this falls into the responsibility of the facetapi module.