Null checks

Dockerfile

@@ -1,4 +1,4 @@
-FROM node:12
+FROM node:14
 
 WORKDIR /app
 

room.js

@@ -108,9 +108,11 @@ function reset(roomId) {
   room.canBuzz = true;
 
   room.participants.forEach(p => {
-    p.ws.send(JSON.stringify({
+    if (p.ws) {
-      type: "reset"
+      p.ws.send(JSON.stringify({
-    }));
+        type: "reset"
+      }));
+    }
   });
 }
 
@@ -137,10 +139,12 @@ function updateScore(roomId, participantId, points) {
 
     participant.score += points;
 
-    participant.ws.send(JSON.stringify({
+    if (participant.ws) {
-      type: "score",
+      participant.ws.send(JSON.stringify({
-      score: participant.score,
+        type: "score",
-    }));
+        score: participant.score,
+      }));
+    }
   }
 
   room.audience.forEach(ws => {

views/audience.handlebars

@@ -65,7 +65,7 @@
       };
 
       function beep() {
-        window.navigator.vibrate(500);
+        if (window.navigator.vibrate) window.navigator.vibrate(500);
       }
 
       function updateScore(participantId, points) {

views/room.handlebars

@@ -69,7 +69,7 @@
       });
 
       function showMessage(msg) {
-        window.navigator.vibrate(500);
+        if (window.navigator.vibrate) window.navigator.vibrate(500);
         document.getElementById('buzzer').disabled = true;
         var mb = document.getElementById('messageBox');
         mb.innerHTML = msg;
@@ -91,7 +91,7 @@
       }
 
       function beep() {
-        window.navigator.vibrate(500);
+        if (window.navigator.vibrate) window.navigator.vibrate(500);
       }
     </script>
   </body>