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src/web/app/common/scripts/streaming/othello-game.ts

@@ -3,7 +3,7 @@ import Stream from './stream';
 export class OthelloGameStream extends Stream {
 	constructor(me, game) {
 		super('othello-game', {
-			i: me.token,
+			i: me ? me.token : null,
 			game: game.id
 		});
 	}

src/web/app/common/views/components/othello.game.vue

@@ -56,6 +56,7 @@ export default Vue.extend({
 
 	computed: {
 		iAmPlayer(): boolean {
+			if (!(this as any).os.isSignedIn) return false;
 			return this.game.user1_id == (this as any).os.i.id || this.game.user2_id == (this as any).os.i.id;
 		},
 		myColor(): Color {