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 => {
+    if (p.ws) {
       p.ws.send(JSON.stringify({
         type: "reset"
       }));
+    }
   });
 }
 
@@ -137,11 +139,13 @@ function updateScore(roomId, participantId, points) {
 
     participant.score += points;
 
+    if (participant.ws) {
       participant.ws.send(JSON.stringify({
         type: "score",
         score: participant.score,
       }));
     }
+  }
 
   room.audience.forEach(ws => {
     ws.send(JSON.stringify({