I need help whit laraver

Hello why i get this error?

I need small help!

There is Error code!

ErrorException Invalid argument supplied for foreach() (View: F:\server\htdocs\yii\yumypizza\resources\views\shop\shopping-cart.blade.php)

here is my code from shop.shopping-cart

@extends('layouts.master')

@section('title')

THE YUMMI PIZZA
@endsection
@section('content')
  @if(Session::has('cart'))

   <div class="row">
        <div class="col-sm-6 col-md-6 col-md-offset-3 col-sm-offset-3">
            
            <ul class="list-group">
                    @foreach($products as $product)
                    <li class="list-group-item">

                        <span class="badge"></span>
                        <strong></strong>
                        <span class="label label-success"></span>

                        <div class="btn-group">
                            <button type="button" class="btn btn-primary btn-xs dropdown-toogle" data-toggle="dropdown">Action <span class="caret"></span></button>
                            <ul class="dropdown-menu">
                                <li><a href="">Reduce by 1</a></li>
                                <li><a href="">Reduce All</a></li>
                            </ul>
                        </div>

                    </li>
                    @endforeach
            </ul>
            
        </div>
   </div>
   <div class="row">
    <div class="col-sm-6 col-md-6 col-md-offset-3 col-sm-offset-3">
        <strong> Total: </strong>
   
        </div>
   </div>
   <hr>
   <div class="row">
    <div class="col-sm-6 col-md-6 col-md-offset-3 col-sm-offset-3">
        <button type="button" class="btn btn-success">CheckOut</button>
   
        </div>
   </div>
@else
<div class="row">
    <div class="col-sm-6 col-md-6 col-md-offset-3 col-sm-offset-3">
        <h2>No Items in Cart!</h2>
</div>
</div>
@endif
@endsection

and here is my controller function code.

public function getCart() {
        if (!Session::has('cart')) {
            return view('shop.shopping-cart', ['products' => null]);
        }
        $oldCart = Session::get('cart');
        $cart = new Cart($oldCart);
        return view('shop.shopping-cart', ['products' => $cart->items, 'totalPrice' => $cart->totalPrice]);
     } 
}

and Route.

    Route::get('/add-to-cart/{id}', [
        'uses' => 'ProductController@getAddToCart',
        'as' => 'product.addToCart'


]);

Route::get('/shopping-cart', [
    'uses' => 'ProductController@getCart',
    'as' => 'product.shoppingCart'


]);

If you can help me about this !

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