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@GreatSince78
Just my laymen's opinion but I think as long as your seat post is long enough to reach beyond the crack and well below the join of your top tube and seat tube then you'll be fine riding the bike as it is, just keep an eye on it to see it the crack lengthens. It looks like the damage was caused by a previous owner using too narrow a post then over-tightening to compensate. Good luck getting it sorted.