If the crack is at the part of the frame rail just above the squarish hole in the frame that the slide stop engagement surface protrudes through, you are probably OK. Most aftermarket frames don't even have that part of the rail at all. They just cut a gap for the slide stop. STI frames have a whole center section missing from both rails!
You may want to have a smith look at it and even machine that piece away to relieve any stress that might be there. It may help prevent more cracking.
Mikey
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