php - Missing argument 1 error in laravel5.1

I don't know why I'm getting this error because I believe that my code should work fine. Please see my code below:

Controller

public function view($id){
  $course = Course::find($id);

  return view('course.view', compact('course'));
}
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Model

protected $fillable = ['deleted'];
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View

@if($course->deleted == 0)
  <h2>Not Deleted</h2>
@endif
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Error:

Missing argument 1 for Illuminate\Database\Eloquent\Model::deleted(), called in .../vendor/laravel/framework/src/Illuminate/Database/Eloquent/Model.php on line 2670 and defined (View: .../Courses/Resources/views/courses/view.blade.php)