NodeJS : MongoError: E11000 duplicate key error collection: tracker-db.users index: username_1 dup k

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NodeJS : MongoError: E11000 duplicate key error collection: tracker-db.users index: username_1 dup key: { username: null }"
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NodeJS : MongoError: E11000 duplicate key error collection: tracker-db.users index: username_1 dup key: { username: null }"
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NodeJS key error tracker-db.users index: dup key: duplicate username: MongoError: username_1 }" { E11000 null collection: :



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