[Plugin: Wp2BB] SQL error when trying to create new post

I’m having this problem when i have wp2bb set to automatically create a new forum thread when i create a new wordpress post:

Fatal error: SQL ERROR [ mysqli ]

Data too long for column 'topic_first_poster_colour' at row 1 [1406]

An sql error occurred while fetching this page. Please contact an administrator if this problem persists. in /[**my local path**]/forum/includes/db/dbal.php on line 697