Call to a member function where() on null (View: /home/farid/blog2/resources/views/jadwalpiket/editemployeepiket.blade.php)

I got an Error message Call to a member function where() on null (View: /home/farid/blog2/resources/views/jadwalpiket/editemployeepiket.blade.php) when I'm trying to create a checkbox for the edit form page

my controllers

public function edit(Employeejadwalpiket $Employee, $id)
{
    $employee = Employee::all();
    $jadwalpiket = Jadwalpiket::all();
    $data = Employeejadwalpiket::with('employees','jadwalpiket')->find($id);

    return view('jadwalpiket.editemployeepiket', compact('Employee','employee','jadwalpiket','data'));

}

my view

<div class="col-xs-12 col-sm-12 col-md-12">
                        <div class="form-group">
                        <strong>Pilih Tugas :</strong>
                        <div class="form-check">
                            @foreach ($jadwalpiket as $j)
                                <label class="form-check-label">
                                <input class="form-check-input" type="checkbox" name="jadwalpiket_id[]" value="" @if (count($Employee->jadwalpiket->where('id', $j->id)))
                                    checked
                                @endif>

                                    &emsp;&emsp;
                                </label>
                                @endforeach
                            </div>
                        </div>
                    </div>

my web.php

Route::get('/editemployeepiket/{id}',[EmployeejadwalpiketController::class, 'edit'])->name('editemployeepiket'); 
Route::post('/upemployeepiket/{id}',[EmployeejadwalpiketController::class, 'update'])->name('upemployeepiket');

please help me to fix it..