[Solved] Angular Error: Argument of type string null is not assignable to parameter of type string

Hi,

I get error in the below code:

onSubmit() {
    console.log(this.registerationForm.value);
    this.user = Object.assign(this.user, this.registerationForm.value);
    localStorage.setItem('Users', JSON.stringify(this.user));
  }

  addUser(user: any){
    let users: any = [];
    if (localStorage.getItem('Users'))
    {
      users = JSON.parse(localStorage.getItem('Users'));
      users = [user, ...users];
    }
    else
    {
      users = [user];
    }
    localStorage.setItem('users', JSON.stringify(users));
  }

error in this line:

users = JSON.parse(localStorage.getItem('Users'));

the error is:

Argument of type 'string | null' is not assignable to parameter of type 'string'.
  Type 'null' is not assignable to type 'string'.