TypeError: Unable to get property 'unshift' of undefined or null reference

[sassan-pour]

Aldo you get the error massage "TypeError: Unable to get property 'unshift' of undefined or null reference" but the database is updated, this only happens when you first time "signup" , but when you refresh the page and try to "login" the updated data will show up in in subsequent update and there is no error massage, it appears that the first time after signup when you try to update you get the error massage but after that when you try to update from login page there is no error massage.