Creating default object from empty value for information - php

Question

I'm trying to edit and save some articles, but I receive this error : Creating default object from empty value. What's wrong in my code?Because, at edit I have my subject, but and submit I get this error.
My error : https://imgur.com/a/eWGqc5B
Controller
public function update($type, $id)
{
/* print_r(Input::all()); die; */
if($type == "News")
{
$article = \App\News::find($id);
$article->subject = Request::input('subject');
$article->public = Request::input('public');
$article->category_id = Request::input('category_id');
$article->information = Request::input('information');
$article->update();
}
if($type == "Event")
{
$article = \App\Event::find($id);
$article->subject = Request::input('subject');
$comm->comments = Request::input('comments');
$article->public = Request::input('public');
$article->category_id = Request::input('category_id');
$article->event_type_id = Request::input('event_type_id');
$article->country = Request::input('country');
$article->starts = Request::input('starts');
$article->ends = Request::input('ends');
$article->organizer = Request::input('organizer');
$article->address = Request::input('address');
$article->city = Request::input('city');
$article->website = Request::input('website');
$article->email = Request::input('email');
$article->telephone = Request::input('telephone');
$article->information = Request::input('information');
$article->update();
}
return redirect(URL::previous());
Line 669 in ArticleController.php
$article->subject = Request::input('subject');
Here is my editEvent code : https://codepen.io/anon/pen/YodwKO
my articles.blade code : https://codepen.io/anon/pen/jjXWOb
My route:
`
Route::post('admin/article/update/{type?}/{id?}', [ 'as' => 'update.article', 'uses' => 'ArticleController#update']);
`

Answer 1

The variable $comm is not defined. It looks like a typo.