Windshield jump, how’s it going with the partial cascade?

Hello everybody, it’s about my Corsa C. I put it in my workshop (rebuilt barn) two weeks ago overnight, it was still completely and the afternoon the next day I see a jump in the windshield, from the bottom right to the middle (clear is getting bigger and bigger now). So now what? Have partial cassock with 150.- excess. There are slices in there or? I only ask because it is absolutely inexplicable to me where the jump comes from, you can see nothing (so you can see nothing). any impact or something like that) except for the jump, and it can’t have fallen on it either, I’ve searched everything about the car. And if I can’t give a reason for the jump now, does the insurance pay?