I had the same issue, Buick covered it under warranty, they took the seat cover off and sewed a new piece on it. But they did screw up my heated seat, it won’t stay on for more than 30 seconds, I didn’t find that out until the warranty was over. They should recalibrate the heated seat after the repair which I read it somewhere.That's a pretty good crack. I had a much smaller crack and I repaired it using some random leather repair kit that I ordered on Amazon. Worked okay to keep it from cracking any more.