Laravel : Creating default object from empty value

I have this following problem while trying to Edit data already existing in my database. my controller name is UserController.php

Error: Creating default object from empty value.

I can Pull data from my database and post it in my form. when trying editing that error occurs.
Here is the block of code that causes the error.

public function update(Request $request, $id)
{

    $this->validate($request, [
        'fname' => 'required',
        'lname' => 'required',
        'email' => 'required',
        'phone' => 'required',
        'address' => 'required',
        'country' => 'required',
        'city' => 'required',
        'bday' => 'required',
        'username' => 'required',
        'password' => 'required',
        'access' => 'required'
    ]);
    $userList = users::find($id);
    $userList->fname = $request->get('fname');
    $userList->lname = $request->get('lname');
    $userList->email = $request->get('email');
    $userList->phone = $request->get('phone');
    $userList->address = $request->get('address');
    $userList->country = $request->get('country');
    $userList->city = $request->get('city');
    $userList->bday = $request->get('bday');
    $userList->username = $request->get('username');
    $userList->password = $request->get('password');
    $userList->access = $request->get('access');
    $userList->save();
    return redirect()->route('users.index')->with('success', 'Data Updated');


}

I can see from the debugger that I send the new data

GET Data empty
POST Data
_token   "mnC6GliLHdSazZkEpaxZQ97aAChr2LObcc9clMlk"
_method  "PATCH"
fname    "test"
lname    "user"
email    "test@user.lara"
phone    "12345678990"
address  "Streat"
country  "countryplace"
city     "somecity"
bday     "2018-01-01"
username     "tester"
password     "test"
access   "Client"

But It highlights $userList->fname = $request->get('fname'); and says : "Creating default object from empty value"

I am new to laravel and cant understand why this is happening. is it because of my form?

  <form method="post" action="">
                    
              <input type="hidden" name="_method" value="PATCH" />

via Chebli Mohamed