Frame break on 2011 yz450

So I picked up this 2011 yz450f, the bike is like MINT, it's sat for 5years in a shop until I bought it, the bike has never been raced or anything, I know the previous owner real well, the bike has 22 original hrs on it before I got it, well under inspecting the radiator fluid I noticed a crack going through the center of the weld, it's not a very long one, maybe about 3 inches long, is there anything I can do about this or am I just shit out of luck, will get pic of it in the AM