Correction key list

tp/src/SW.js

@@ -27,8 +27,8 @@ let SW = () => {
                 people.previous ? <button key={"previous"} onClick={() => loadData(people.previous)}>Previous</button> : "",
                 people.next ? <button key={"next"} onClick={() => loadData(people.next)}>Next</button> : "",
                 <ul key={"people"}>
-                    {people.results.map((p, idx) => {
-                        return <li key={idx}>
+                    {people.results.map(p => {
+                        return <li key={p.url}>
                             {p.name}
                             <button onClick={() => setDetails(p)}>Details</button>
                         </li>