git submodule error: “fatal: reference is not a tree”

Common error while updating a git submodule:

fatal: reference is not a tree: 9b65a5f376fd806c5f989f0a69e00ada391dabf4
Unable to checkout '9b65a5f376fd806c5f989f0a69e00ada391dabf4' in submodule path 'path/to/submodule'

Quick fix:

git submodule sync
git submodule update

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