React/JS How to get the value of last index of props.data which is an object

I have an application that passes array object to a child component and the child component can access the data via "props.data" whose format is as follows:

....

246: {key: 3510, date: "10/27/2020", name: "Canada", total_cases: 222887, cases_today: 2674, …}
247: {key: 3522, date: "10/28/2020", name: "Canada", total_cases: 225586, cases_today: 2699, …}
248: {key: 3540, date: "10/29/2020", name: "Canada", total_cases: 228542, cases_today: 2956, …}
249: {key: 3566, date: "10/30/2020", name: "Canada", total_cases: 231999, cases_today: 3457, …}
length: 250
__proto__: Array(0)

I want to get only the last value of total_cases and it shows an error that it's undefined when I tried "props.data[props.data.length-1].total_cases" Any idea what would cause this error? Thank you for your time!

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