undefined method 'each' for nil

PMC:7127067 / 9595-9596 JSONTXT

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    2_test

    {"project":"2_test","denotations":[{"id":"32113704-31994742-55638567","span":{"begin":0,"end":1},"obj":"31994742"},{"id":"32113704-31994742-55638567","span":{"begin":0,"end":1},"obj":"31994742"}],"text":"8"}