Fix

commands/edit-image/crop-to-content.js

@@ -35,7 +35,7 @@ module.exports = class CropToContentCommand extends Command {
 		if (canvas.width === data.width && canvas.height === data.height) {
 			return msg.say('Looks like this image is already cropped to its content.');
 		}
-		const attachment = canvas.toBuffer();
+		const attachment = canvas.toBuffer('image/png');
 		if (Buffer.byteLength(attachment) > 8e+6) return msg.reply('Resulting image was above 8 MB.');
 		return msg.say({ files: [{ attachment, name: 'crop-to-content.png' }] });
 	}