small percenatage of my web visitor have this errors (based on sentry error tracker):

Uncaught TypeError: Cannot read property 'getItem' of null - at line 809

Uncaught SecurityError: Failed to read the 'localStorage' property from 'Window': Access is denied for this document. - at line 809

Uncaught ReferenceError: FormStorage is not defined - at line 654

TypeError: undefined is not a function - at line 686