Unset timer when time go to minus

react/src/components/Main.jsx

@@ -69,10 +69,13 @@ function Main(props) {
     socket.on('created', data => {
       if (DEBUG) console.log('account has been created.')
       let sec = 3;
+      let myTimer;
       (function countdown () {
         setModalTitle("Your account is ready!");
         setModalBody(`Will redirect in ${sec--} seconds.`);
-        setTimeout(countdown, 1000);
+        myTimer = setTimeout(countdown, 1000);
+        if (sec < 0)
+          clearTimeout(myTimer);
       })()
       setTimeout(() => {
         if (DEBUG) console.log('Redirecting to /test')