Force tokenmismatchexception in laravel

I'm currently working on a Laravel application that someone else made, the site has some problems with the tokenmismatchexceptionI developed some code to deal with it. The session are being saved in the database, so actually what I want to know is what can I do to emulate a defeted token? I tried deleting and editing the register from the session table but it gets renewed, and I just want to force an error to see how the application respond to this situation. Thanks

via Chebli Mohamed