To Solve EvalError: Possible side-effect in debug-evaluate This error is caused by https://chromium-review.googlesource.com/c/v8/v8/+/3557234/ and fixed in https://chromium-review.googlesource.com/c/v8/v8/+/3660253 and it'll be resolved when we roll Chromium to contain the fix. Reference Is Github This is a Chrome Specific Issue So You Can Test Your website in Other Browsers and You Might not Face this error in a Different Browser.