Error: Unsupported image type

## Issue
Error: Unsupported image type
at setSource (C:\Users\Usr\Desktop\Xenova-rewrite-master\node_modules\canvas\lib\image.js:91:13)
at C:\Users\Usr\Desktop\Xenova-rewrite-master\node_modules\canvas\lib\image.js:59:11
at C:\Users\Usr\Desktop\Xenova-rewrite-master\node_modules\simple-get\index.js:89:7
at IncomingMessage. (C:\Users\Usr\Desktop\Xenova-rewrite-master\node_modules\simple-concat\index.js:8:13)
at Object.onceWrapper (events.js:421:28)
at IncomingMessage.emit (events.js:327:22)
at endReadableNT (_stream_readable.js:1327:12)
at processTicksAndRejections (internal/process/task_queues.js:80:21)

## Steps to Reproduce
```js
const canvas = Canvas.createCanvas(900, 500);

const ctx = canvas.getContext('2d');

Canvas.registerFont('Font/visitor1.ttf', { family: "visitor" });

const background = await Canvas.loadImage("Images/joinleave1.jpg");

ctx.drawImage(background, 0, 0, canvas.width, canvas.height);

ctx.strokeStyle = '#74037b';

ctx.strokeRect(0, 0, canvas.width, canvas.height);

ctx.font = '25px visitor';
ctx.fillStyle = '#ffffff';
ctx.fillText(`Level ${r[0].level}`, canvas.width / 3, canvas.height / 3.7);

ctx.beginPath();

ctx.arc(125, 125, 100, 0, Math.PI * 2, true);

ctx.closePath();

ctx.clip();

const avatar = await Canvas.loadImage(message.author.displayAvatarURL());

ctx.drawImage(avatar, 25, 0, 200, canvas.height);

const attachment = new Attachment(canvas.toBuffer(), "level.jpg")

message.channel.send(attachment);
```

## Your Environment
Canvas 2.6.0
Windows 10 (x64)
Node 14.14.0