Rancho Loco
There should not be much stress in the area in a typical stock.
I understand that, but in this particular stock, it's developed some kind of stree/warpage that has split the wood in that area.
In my experiences with old furniture and cabinets, this situation would call for some mechanical joining, or a spline (or splines) installed with a good epoxy; west systems in my case.. Love the stuff.
Not saying this is the fix in this case, just looking for more edumication. I wouldn't mind messing around with stocks one day.