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i need a little help getting my code to work. I can't get the star score to increase. i can only make it go NAN... HELP ? "Making you own game" on the last part i'm having trouble making tht work.

Hi everyone, // If I make grammar mistakes, please excuse me. I'm still not fluent in English ahah I'm a beginner on Phaser, had to have a look into that for my courses. I'm now upgrading a basic tutorial and I want to use a timer (a countdown) in that game but it really doesn't work, it only create a black screen. To do this, I followed this tutorial : https://www.joshmorony.com/how-to-create-an-accurate-timer-for-phaser-games/ I tried other, without success. Some were a bit to hard to understand, others were pretty ugly ! So here is the code I used , can you help me ? : var game = new Phaser.Game(800, 600, Phaser.AUTO, '', { preload: preload, create: create, update: update }); function preload() { game.load.image('sky', 'assets/sky.png'); game.load.image('ground', 'assets/platform.png'); game.load.image('star', 'assets/star.png'); // on ajoute un diamant game.load.image('dmd','assets/diamond.png') game.load.spritesheet('dude', 'assets/dude.png', 32, 48); } var player; var platforms; var cursors; var stars; var diamonds; var score = 0; var scoreText; var countdown; function create() { // We're going to be using physics, so enable the Arcade Physics system game.physics.startSystem(Phaser.Physics.ARCADE); // A simple background for our game game.add.sprite(0, 0, 'sky'); // The platforms group contains the ground and the 2 ledges we can jump on platforms = game.add.group(); // We will enable physics for any object that is created in this group platforms.enableBody = true; // Here we create the ground. var ground = platforms.create(0, game.world.height - 64, 'ground'); // Scale it to fit the width of the game (the original sprite is 400x32 in size) ground.scale.setTo(2, 2); // This stops it from falling away when you jump on it ground.body.immovable = true; // Now let's create two ledges var ledge = platforms.create(400, 400, 'ground'); ledge.body.immovable = true; ledge = platforms.create(-150, 250, 'ground'); ledge.body.immovable = true; ledge = platforms.create(-100, 510, 'ground'); ledge.body.immovable = true; // The player and its settings player = game.add.sprite(32, game.world.height - 150, 'dude'); // We need to enable physics on the player game.physics.arcade.enable(player); // Player physics properties. Give the little guy a slight bounce. player.body.bounce.y = 0.2; player.body.gravity.y = 350; player.body.collideWorldBounds = true; // Our two animations, walking left and right. player.animations.add('left', [0, 1, 2, 3], 10, true); player.animations.add('right', [5, 6, 7, 8], 10, true); // Finally some stars to collect stars = game.add.group(); // We will enable physics for any star that is created in this group stars.enableBody = true; // Here we'll create 12 of them evenly spaced apart for (var i = 0; i < 10; i++) { // Create a star inside of the 'stars' group var star = stars.create(i * 70, 0, 'star'); // Let gravity do its thing star.body.gravity.y = 15; // This just gives each star a slightly random bounce value star.body.bounce.y = 0.2 + Math.random() * 0.2; } // On ajoute les diamants diamonds=game.add.group(); diamonds.enableBody=true; // création des diamants dans l'espace de jeu for (var i = 0; i < 3; i++) { var dmd = diamonds.create(i * 70, 0, 'dmd'); dmd.body.gravity.y = 30; dmd.body.bounce.y = 0.1 + Math.random() * 0.2; } countdown.startTime = new Date(); countdown.totalTime = 120; countdown.timeElapsed = 0; countdown.createTimer(); countdown.gameTimer = game.time.events.loop(100, function(){ countdown.updateTimer(); }); // The score scoreText = game.add.text(16, 16, 'score: 0', { fontSize: '32px', fill: '#000' }); // Our controls. cursors = game.input.keyboard.createCursorKeys(); } function update() { // Collide the player and the stars (et les diamants du coup) with the platforms game.physics.arcade.collide(stars, platforms); game.physics.arcade.collide(diamonds, platforms); game.physics.arcade.collide(player, platforms); // Checks to see if the player overlaps with any of the stars, if he does call the collectStar function game.physics.arcade.overlap(player, stars, collectStar, null, this); // idem pour les diamants game.physics.arcade.overlap(player, diamonds, collectDiamonds, null, this); // Reset the players velocity (movement) player.body.velocity.x = 0; if (cursors.left.isDown) { // Move to the left player.body.velocity.x = -150; player.animations.play('left'); } else if (cursors.right.isDown) { // Move to the right player.body.velocity.x = 150; player.animations.play('right'); } else { // Stand still player.animations.stop(); player.frame = 4; } // Allow the player to jump if they are touching the ground. if (cursors.up.isDown && player.body.touching.down) { player.body.velocity.y = -350; } } function collectStar (player, star) { // Removes the star from the screen star.kill(); // Add and update the score score += 10; scoreText.text = 'Score: ' + score; } function collectDiamonds (player, dmd) { dmd.kill(); score += 50; scoreText.text = 'Score: ' + score; } function createTimer(){ var countdown = this; countdown.timeLabel = countdown.game.add.text(countdown.game.world.centerX, 100, "00:00", {font: "100px Arial", fill: "#fff"}); countdown.timeLabel.anchor.setTo(0.5, 0); countdown.timeLabel.align = 'center'; } function updateTimer (){ var countdown = this; var currentTime = new Date(); var timeDifference = countdown.startTime.getTime() - currentTime.getTime(); //Time elapsed in seconds countdown.timeElapsed = Math.abs(timeDifference / 1000); //Time remaining in seconds var timeRemaining = countdown.timeElapsed; //Convert seconds into minutes and seconds var minutes = Math.floor(countdown.timeElapsed / 60); var seconds = Math.floor(countdown.timeElapsed) - (60 * minutes); //Display minutes, add a 0 to the start if less than 10 var result = (minutes < 10) ? "0" + minutes : minutes; //Display seconds, add a 0 to the start if less than 10 result += (seconds < 10) ? ":0" + seconds : ":" + seconds; countdown.timeLabel.text = result; if(countdown.timeElapsed >= countdown.totalTime){ // On cherche la fin du timer result = "Rate !"; } }

When I change tab in chrome browser on PC and visit again after like 30 minutes the game screen is blank with this warning message: WebGL: CONTEXT_LOST_WEBGL: loseContext: context lost On one of my android tabs that happens when I press home button and open android browser again. I tried the search function of this forum but could not find anything relevant. What is happening and how to prevent it? If anyone knows how to handle the context_lost situation or redirect me to the helpful resource. Thanks