# Null error -debug support

**URL:** <https://forum.code.org/t/null-error-debug-support/40534>\
**Category:** Coding and Debugging Help\
**Tags:** csd-unit-3\
**Created:** [March 12, 2025, 2:37pm UTC](https://forum.code.org/t/null-error-debug-support/40534 "2025-03-12T14:37:19Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![leslie.dillon](https://avatars.discourse-cdn.com/v4/letter/l/b19c9b/32.png) [@leslie.dillon](https://forum.code.org/u/leslie.dillon)\
**Post date:** [March 12, 2025, 2:37pm UTC](https://forum.code.org/t/null-error-debug-support/40534/1 "2025-03-12T14:37:19Z")

</div>

Student is seeing an error that reads: Error: line 51: TypeError: Cannot read properties of null (reading ‘copy’). We cannot find the error.

// Variables  
var score = 0;  
// Create Sprites  
var egg = createSprite(350,200);  
egg.setAnimation(“egg”);  
egg.scale = 0.5;

var player = createSprite(200,200);  
player.setAnimation(“edgarLeft”);  
player.setCollider(“circle”, 0, 0, 20);

var enemy1 = createSprite();  
enemy1.setCollider(“circle”);  
setEnemy1();  
var speed1 = randomNumber(1, 5);

var enemy2 = createSprite();  
enemy2.setCollider(“circle”);  
setEnemy2();  
var speed2 = randomNumber(1, 5);

function draw() {  
// draw the background  
gameBackground();  
// update the sprites  
enemiesTouchCake();  
movePlayer();  
displaceEnemies();  
enemiesTouchWater();  
showScore();  
drawSprites();  
}

// Functions  
function gameBackground() {  
noStroke();  
if (score \>= 100) {  
background(rgb(randomNumber(0, 255), randomNumber(0, 255), randomNumber(0, 255)));  
} else {  
background(rgb(0,100,255));  
}  
fill(rgb(100,100,100));  
rect(0,150,400,100);  
fill(rgb(80,80,80));  
rect(0,140,400,10);  
rect(0,250,400,10);  
}

function enemiesTouchCake(){  
if (enemy1.isTouching(egg)) {  
score = score - 2;  
setEnemy1();  
}  
if (enemy2.isTouching(egg)) {  
score = score - 2;  
setEnemy2();  
}  
}

function movePlayer(){  
if (keyDown(“right”) && (player.x \<= 400)) {  
player.setAnimation(“edgarRight”);  
player.velocityX = 5;  
} else if (keyDown(“left”) && (player.x \>= 0)) {  
player.setAnimation(“edgarLeft”);  
player.velocityX = -5;  
} else {  
player.velocityX = 0;  
}

if (keyDown(“up”) && (player.y \>= 0)) {  
player.velocityY = -5;  
} else if (keyDown(“down”) && (player.y \<= 400)) {  
player.velocityY = 5;  
} else {  
player.velocityY = 0;  
}  
}

function displaceEnemies(){  
player.displace(enemy1);  
player.displace(enemy2);  
}

function enemiesTouchWater(){  
if ((enemy1.y \< 150) || (enemy1.y \> 250)) {  
score = score + 1;  
setEnemy1();  
}  
if ((enemy2.y \< 150) || (enemy2.y \> 250)) {  
score = score + 1;  
setEnemy2();  
}  
}

function showScore() {  
fill(“white”);  
textSize(20);  
text(“Score”,20,20,200,100);  
text(score,20,40,200,100);  
}

function setEnemy1() {  
enemy1.y = randomNumber(140, 240);  
enemy1.x = 0;  
enemy1.setAnimation(“scary-face”);  
enemy1.velocityX = speed1;  
speed1 = randomNumber(1,5);  
}  
function setEnemy2() {  
enemy2.y = randomNumber(140, 240);  
enemy2.x = 0;  
enemy2.setAnimation(“scary-face”);  
enemy2.velocityX = speed2;  
speed2 = randomNumber(1, 5);

---

<div class="post-metadata">

**Author:** ![varrience](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.code.org/varrience/32/8042_2.png) [@varrience](https://forum.code.org/u/varrience)\
**Post date:** [March 12, 2025, 6:08pm UTC](https://forum.code.org/t/null-error-debug-support/40534/2 "2025-03-12T18:08:30Z")

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since i do not have the test environment my knowledge will be very surface level, you are missing a brace at the end of your last function call if this is not your issue i would appreciate a link to the program you are trying to debug

# Varrience

---

<div class="post-metadata">

**Author:** ![melynn](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.code.org/melynn/32/4925_2.png) [@melynn](https://forum.code.org/u/melynn)\
**Post date:** [March 12, 2025, 8:21pm UTC](https://forum.code.org/t/null-error-debug-support/40534/3 "2025-03-12T20:21:23Z")

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Hi @leslie.dillon,

If you didn’t get it to work with @varrience 's suggestion, please click the SHARE button of the project and paste the sharable link so we can take a look at the whole program.

Good luck!  
~Michelle