I'm trying to take data from my session but every time I run the tests I get this error

    header-core:   return JSON.parse(window.sessionStorage.getItem(profileDataHeader));
header-core:                                           ^
header-core: TypeError: Cannot read property 'getItem' of undefined
header-core:     at getProfileDataHeader (C:\Users\XXXXX\Documents\YieldPortalHeader\packages\core\src\helpers\utils\/storage.js:9:36)

Code:

const profileData = getProfileDataHeader();

and what the getProfileDataHeader does:

export const getProfileDataHeader = () =>
  JSON.parse(window.sessionStorage.getItem(profileDataHeader));

There are other parts from the code which uses the getProfileDataHeader but none of them returns me this error, only when I make the call in this file in specific.

Can anybody help me? I guess the solution might be pretty stupid but I can't get through it!