Writing to MongoDB about pro-mern-stack HOT 2 OPEN

Is anyone else getting this issue after the end of Chapter 6?

react.js:20209 Warning: Each child in an array or iterator should have a unique "key" prop. Check the render method of IssueTable. See https://fb.me/react-warning-keys for more information.
in IssueRow (created by IssueTable)
in IssueTable (created by IssueList)
in div (created by IssueList)
in IssueList

I have key already set in IssueTable:

function IssueTable(props) {
    const issueRows = props.issues.map(issue => <IssueRow key={issue._id} issue={issue} />);
    console.log(issueRows);
    const borderStyle = {border: "1px solid silver", padding: 6};
    return (
        <table className="bordered-table">
            <thead>
                    <tr>
                        <th>Id</th>
                        <th>Title</th>
                        <th>Owner</th> 
                        <th>Created</th>
                        <th>Effort</th>
                        <th>Completion Date</th>
                        <th>Title</th>
                    </tr>
            </thead>
            <tbody>
                {issueRows}
            </tbody>
        </table>
    )
}

from pro-mern-stack.

Is anyone else getting this issue after the end of Chapter 6?

react.js:20209 Warning: Each child in an array or iterator should have a unique "key" prop. Check the render method of IssueTable. See https://fb.me/react-warning-keys for more information.
in IssueRow (created by IssueTable)
in IssueTable (created by IssueList)
in div (created by IssueList)
in IssueList

I have key already set in IssueTable:

function IssueTable(props) {
    const issueRows = props.issues.map(issue => <IssueRow key={issue._id} issue={issue} />);
    console.log(issueRows);
    const borderStyle = {border: "1px solid silver", padding: 6};
    return (
        <table className="bordered-table">
            <thead>
                    <tr>
                        <th>Id</th>
                        <th>Title</th>
                        <th>Owner</th> 
                        <th>Created</th>
                        <th>Effort</th>
                        <th>Completion Date</th>
                        <th>Title</th>
                    </tr>
            </thead>
            <tbody>
                {issueRows}
            </tbody>
        </table>
    )
}

you probably didn't include _id in your query.

from pro-mern-stack.