Uncaught SyntaxError: JSON.parse: unexpected end of data at line 1 column 1 of the JSON data in javascrtipt

I have a problem with my script. while trying Crypto.JS

let bytes = CryptoJS.AES.decrypt('cipher', ENCRYPTKEY);
let decryptedData = JSON.parse(bytes.toString(CryptoJS.enc.Utf8));

it showing SyntaxError: JSON.parse: unexpected end of data at line 1 column 1 of the JSON data.

please give me solution.

Thank you.