This weekend I did go to the snowboard shop. The guys did tell me that I had to get it fixed or else the backside might loosen due to the rapid temperature changes (from cold to warm).
Now about the costs. This stupidity cost me 130 US dollars (120CHF) to get it fixed. I will show you guys a picture of the fixed board friday.
Again thanks for the advice!
Wow, I would recommend not going back to that shop ever. No way that is anywhere close to 130 worth of work.