merhaba laravel üzerinde kendimi geliştiriyorum fakat bir sorunum var

  public function category_detail(Request $request,$slug)
    {  $g_setting = GeneralSetting::where('id', 1)->first();
        $property_page_data = PagePropertyItem::find(1);
        $property_categories = PropertyCategory::get();
        $property_locations = PropertyLocation::get();
        $amenities = Amenity::get();
         
     
         // Mülkleri sorgulamaya başlıyoruz
         // Fetch the selected property category
    $property_category_detail = PropertyCategory::where('property_category_slug', $slug)->first();
         $properties = Property::with('user')->orderBy('id', 'desc');
     
         if ($request->has('amenity')) {
             $properties = $properties->whereHas('propertyAminities', function ($query) use ($request) {
                 $query->whereIn('amenity_id', $request->amenity);
             });
         }
     
         if ($request->has('location')) {
             $properties = $properties->whereIn('property_location_id', $request->location);
         }
     
         if ($request->has('category')) {
             $properties = $properties->whereIn('property_category_id', $request->category);
         }
     
         if ($request->has('property_type')) {
             if ($request->property_type == 'sale') {
                 $properties = $properties->where('property_type', 'For Sale');
             } elseif ($request->property_type == 'rent') {
                 $properties = $properties->where('property_type', 'For Rent');
             }
         }
     
         if ($request->has('text')) {
             $properties = $properties->where('property_name', 'LIKE', '%' . $request->text . '%');
         }
     
         // Sonuçları sayfalandırıyoruz
         $properties = $properties->paginate(15);
         $properties->appends($request->except('page'));
        $g_setting = GeneralSetting::where('id', 1)->first();
        $property_category_page_data = PagePropertyCategoryItem::where('id', 1)->first();
        $property_category_detail = PropertyCategory::where('property_category_slug',$slug)->first();
        $property_items = Property::with('rPropertyCategory','rPropertyLocation')->where('property_category_id',$property_category_detail->id)->paginate(15);
        return view('front.property_category_detail', compact(
            'g_setting', 'property_category_detail', 'properties', 'property_page_data',
            'property_categories', 'property_locations', 'amenities'
        ));
    }

kontroller kodum

web.php

Route::get('Kategori/tumu', [PropertyControllerForFront::class,'category_all'])
    ->name('front_property_category_all');
Route::get('{slug}', [PropertyControllerForFront::class,'category_detail'])
    ->name('front_property_category_detail');
Route::get('Konum/tum-ilanlar', [PropertyControllerForFront::class,'location_all'])
    ->name('front_property_location_all');
Route::get('honaz-{slug}', [PropertyControllerForFront::class,'location_detail'])
    ->name('front_property_location_detail');
Route::get('agent/{type}/{id}', [PropertyControllerForFront::class,'agent_detail'])
    ->name('front_property_agent_detail');
    
Route::get('ilan-detay/', [PropertyControllerForFront::class,'property_result'])
    ->name('front_property_result');

hata kodu ise şu
ErrorException
Attempt to read property "id" on null