Payment Klarna checkout

Hi!
I cant get Klarna checkout to work. When in test-mode everting seams fine but i dont get any orders when i log in to klarna.
This is one of my error messeges

"PHP Notice: unserialize(): Error at offset 0 of 2 bytes in public_html/catalog/controller/klarna/payment.php on line 383".

And if i disable test-mode i get this error message

"Payment A technical error with the connection to Klarna. No payment has been made. Please try again or contact our customer service. Message from Klarna: The authorization was not correct"

Thankful for all tips and tricks i can get

Have you added this to the Github page, for review?

https://github.com/opencart/opencart

Cheers