Greengage Tree

in Fruit & veg
I have a 10 year old Greengage tree which has produced fruit for at least the last three years. This year the tree went into full bloom (April) and then nothing, no leaves have appeared. I can see the buds where the leaves should have come from. I have scratched the surface of the bark and the wood is green underneath. Any ideas if the tree is worth keeping until next year?
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