خطأ Creating default object from empty value في إضافة البيانات في لارافل ؟

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Creating default object from empty value

<?php
//live wire code
namespace App\Http\Livewire\Admin;
use App\Models\Category;
use App\Models\Product;
use Carbon\Carbon;
use Illuminate\Contracts\Session\Session;
use Livewire\Component;
use Illuminate\Support\Str;
use Livewire\WithFileUploads;

class AdminEditProductComponent extends Component
{
    use WithFileUploads;

    public $name;
    public $slug;
    public $short_description;
    public $description;
    public $regular_price;
    public $sale_price;
    public $SKU;
    public $stock_status;
    public $featured;
    public $quantity;
    public $image;
    public $category_id;
    public $newimage;
    public $product_id;

    public function mount($product_slug){

        $product = Product::where('slug',$product_slug)->first();

         $this->name = $product->name;
         $this->slug = $product->slug ;
         $this->short_description= $product->short_description;
         $this->description = $product->description;
         $this->regular_price = $product->regular_price;
         $this->sale_price = $product->sale_price;
         $this->SKU = $product->SKU;
         $this->stock_status = $product->stock_status;
         $this->featured = $product->featured;
         $this->quantity = $product->quantity;
         $this->image = $product->image;
         $this->category_id = $product->category_id;
         $this->newimage = $product->newimage ;
         $this->product_id = $product->product_id;

    }
    public function generateslug(){

        $this->slug = Str::slug($this->name,'-');
    }

    public function updateProduct(){

        $product = Product::find($this->product_id);
        $product->name = $this->name;
        $product->slug = $this->slug;
        $product->short_description = $this->short_description;
        $product->description = $this->description;
        $product->regular_price = $this->regular_price;
        $product->sale_price = $this->sale_price;
        $product->SKU = $this->SKU;
        $product->stock_status = $this->stock_status;
        $product->featured = $this->featured;
        $product->quantity = $this->quantity;
        if($this->newimage){
            $imageName = Carbon::now()->timestamp.'-' .$this->newimage->extension();
            $this->newimage->storeAs('products',$imageName);
            $product->image = $imageName;
        }

        $product->category_id = $this->category_id;

        $product->save();

        Session()->flash('message','Product Has Been Updated Successfully!');
    }
    public function render()
    {
        $categories = Category::all();

        return view('livewire.admin.admin-edit-product-component',[ 'categories' => $categories ])->layout('layouts.base');
    }
}

<!--ملف العرض view -->
<div>
    <div class="container" style="padding: 30px 0;">
        <div class="row">
            <div class="col-md-12">
                <div class="panel panel default">
                    <div class="panel-heading">
                        <div class="row">
                            <div class="col-md-6">
                                Edit Product
                            </div>
                            <div class="col-md-6">
                                <a href="{{route('admin.products')}}" class="btn btn-success pull-right">All Products</a>
                            </div>
                            <div class="panel-body">
                                @if(Session::has('message'))
                                    <div class="alert alert-success" role="alert">{{ Session::get('message')}}</div>
                                @endif
                                <form class="form-horizontal" enctype="multipart/form-data" wire:submit.prevent='updateProduct'>
                                    @csrf
                                    <div class="form-group">
                                        <label class="col-md-4 control-label">Product Name</label>
                                        <div class="col-md-4">
                                            <input type="text" placeholder="Product Name"  class="form-control input-md" wire:model='name' wire:keyup='generateslug'>
                                        </div>
                                    </div>
                                    <div class="form-group">
                                        <label class="col-md-4 control-label">Product Slug</label>
                                        <div class="col-md-4">
                                            <input type="text" placeholder="Product Slug"  class="form-control input-md" wire:model='slug'>
                                        </div>
                                    </div>
                                    <div class="form-group">
                                        <label class="col-md-4 control-label">Short Description</label>
                                        <div class="col-md-4">
                                            <textarea type="text" placeholder="Short Description"  class="form-control" wire:model='short_description'></textarea>
                                        </div>
                                    </div>
                                    <div class="form-group">
                                        <label class="col-md-4 control-label">Description</label>
                                        <div class="col-md-4">
                                            <textarea type="text" placeholder="Description"  class="form-control" wire:model='description'></textarea>
                                        </div>
                                    </div>
                                    <div class="form-group">
                                        <label class="col-md-4 control-label">Regular Price</label>
                                        <div class="col-md-4">
                                            <input type="text" placeholder="Regular Price" class="form-control input-md" wire:model='regular_price'>
                                        </div>
                                    </div>
                                    <div class="form-group">
                                        <label class="col-md-4 control-label">Sale Price</label>
                                        <div class="col-md-4">
                                            <input type="text" placeholder="Sale Price" class="form-control input-md" wire:model='sale_price'>
                                        </div>
                                    </div>
                                    <div class="form-group">
                                        <label class="col-md-4 control-label">SKU</label>
                                        <div class="col-md-4">
                                            <input type="text" placeholder="SKU" class="form-control input-md" wire:model='SKU'>
                                        </div>
                                    </div>
                                    <div class="form-group">
                                        <label class="col-md-4 control-label">Stock</label>
                                        <div class="col-md-4">
                                            <select class="form-control" wire:model='stock_status'>
                                                <option value="instock">In Stock </option>
                                                <option value="outofstock">Out Of Stock </option>
                                            </select>
                                        </div>
                                    </div>
                                    <div class="form-group">
                                        <label class="col-md-4 control-label">Featured</label>
                                        <div class="col-md-4">
                                            <select class="form-control" wire:model='featured'>
                                                <option value="0">No</option>
                                                <option value="1">Yes</option>
                                            </select>
                                        </div>
                                    </div>
                                    <div class="form-group">
                                        <label class="col-md-4 control-label">Quantity</label>
                                        <div class="col-md-4">
                                            <input type="text" placeholder="Quantity" class="form-control input-md" wire:model='quantity'>
                                        </div>
                                    </div>
                                    <div class="form-group">
                                        <label class="col-md-4 control-label">Product Image</label>
                                        <div class="col-md-4">
                                            <input type="file" class="input-file" wire:model='newimage'>
                                            @if($newimage)
                                                <img src="{{$newimage->temporaryUrl()}}" width="120">
                                            @else
                                                <img src="{{ asset('assets/images/products')}}/{{$image}}" width="120" >
                                            @endif
                                        </div>
                                    </div>
                                    <div class="form-group">
                                        <label class="col-md-4 control-label">Category</label>
                                        <div class="col-md-4">
                                            <select class="form-control" wire:model='category_id'>
                                                <option value="">Select Category</option>
                                                @foreach ($categories as $category)
                                                    <option value="{{$category->id}}">{{$category->name}}</option>
                                                @endforeach
                                                
                                            </select>
                                        </div>
                                    </div>
                                    <div class="form-group">
                                        <label class="col-md-4 control-label"></label>
                                        <div class="col-md-4">
                                            <button type="submit" class="btn btn-primary">Update</button>
                                        </div>
                                    </div>
                                </form>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    
    </div>
</div>