I can't make a judgement based on those crappy pictures. I can see a faint grey line, but it that's the crack?? I can't tell. How does it run? How deep does it go? Does it wander off the side?
Take the bow outside, in bright daylight. Lay the bow down (not hovering in mid-air). Set the camera on "macro"-mode, which is the button with the little flower icon. The report some pics and we might be able to see the cracks. But it remains difficult for us to get a 3D image of how the crack exactly runs.
A superglue soak, wrap with thread/sinew and a backing might save the bow if it's a smallish crack that doesn't wander off the side too much.