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Instead the keypoint becomes null after calling the method.

this means, no descriptors could be computed for your given keypoints (so the invalid ones were removed)

I then prune keypoints according to few criteria

this needs some explanation ?

Please post the necessary fix.

hate to say so, but most probably you'll have to change your concept. maybe your pruning is broken ? maybe you can't do this with AKAZE keypoint ? noone knows,without more information

Instead the keypoint becomes null after calling the method.

this means, no descriptors could be computed for your given keypoints (so the invalid ones were removed)

I then prune keypoints according to few criteria

this needs some explanation ?? you're pruning unmatched keypoints ? why at all?

Please post the necessary fix.

hate to say so, but most probably you'll have to change your concept. maybe your pruning is broken ? maybe you can't do this with AKAZE keypoint ? noone knows,without more information