How to create Url that contain name and id laravel

I'm trying to make a product url have id and name like, http://127.0.0.1:8000/productDetail/23/walking shoes. Previously the url was showing only the product id, I have tried to follow some sources online and I'm stuck with this error A non-numeric value encountered how can I make the url contains both product id and name?

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Route

   Route::get('/productDetail/{id}/{pro_name}', 
  'HomeController@detailPro');

Controller

   public function shop()
   {
    $products=product::with('ProductsPhoto')->paginate(2);
    return view('front.shop',compact('products'));
   }

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