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I wouldn't be too worried, if it really is a crack you should also see some of it propagating on the outside of the frame. Hopefully, it's just a scratch.
You can do your own makeshift crack detection with WD-40 and talcum powder. Put some WD-40 on the spot you want to check, leave it on for a minute or two and wipe it off with a dry rag. Sprinkle talcum powder over the area and let it sit for 5-10 minutes. If there's a crack, you'll see the WD-40 wicking up into the talcum powder and making it darker. There's special test kits with dye that makes it easier to see, but the WD-40/talcum method is a good start.
You can do your own makeshift crack detection with WD-40 and talcum powder. Put some WD-40 on the spot you want to check, leave it on for a minute or two and wipe it off with a dry rag. Sprinkle talcum powder over the area and let it sit for 5-10 minutes. If there's a crack, you'll see the WD-40 wicking up into the talcum powder and making it darker. There's special test kits with dye that makes it easier to see, but the WD-40/talcum method is a good start.
