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What Stevo said - some PVA wood glue in there (GENTLY open the damage to get the glue in deep), then masking tape or clamp it, wipe off excess straight away, and inspect in a few hours when the glue has gone off. Possible filling/sanding/staining or other finishing etc. required at that stage but it might be almost invisible.
A bit of careful gluing and that'll be ok!