You are selling Wheat SEED ? Why are you doing this?
Put it on the palette on the farm.
Nevertheless it should not crash the game.
Ich can replicate it, too. Bought wheat seed at the own and when I drive into harbour selling trigger it crashs.
I wasnt selling it, just driving around. I took it to my farm, dumped it in the loft, which produces another bug, which is a never ending dump anikmation.