fix the paypal callback

[xxl4]

[2024-05-07 09:53:02] prod.ERROR: Call to a member function toArray() on null {"exception":"[object] (Error(code: 0): Call to a member function toArray() on null at /www/wwwroot/Bagisto/packages/Webkul/Checkout/src/Cart.php:901)
[stacktrace]
#0 /www/wwwroot/Bagisto/packages/Webkul/Checkout/src/Cart.php(791): Webkul\Checkout\Cart->toArray()
#1 /www/wwwroot/Bagisto/vendor/laravel/framework/src/Illuminate/Support/Facades/Facade.php(355): Webkul\Checkout\Cart->prepareDataForOrder()
#2 /www/wwwroot/Bagisto/packages/Webkul/Paypal/src/Helpers/Ipn.php(92): Illuminate\Support\Facades\Facade::__callStatic()
#3 /www/wwwroot/Bagisto/packages/Webkul/Paypal/src/Helpers/Ipn.php(67): Webkul\Paypal\Helpers\Ipn->getOrder()
#4 /www/wwwroot/Bagisto/packages/Webkul/Paypal/src/Http/Controllers/StandardController.php(75): Webkul\Paypal\Helpers\Ipn->processIpn()
#5 /www/wwwroot/Bagisto/vendor/laravel/framework/src/Illuminate/Routing/Controller.php(54): Webkul\Paypal\Http\Controllers\StandardController->ipn()
#6 /www/wwwroot/Bagisto/vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php(43): Illuminate\Routing\Controller->callAction()
#7 /www/wwwroot/Bagisto/vendor/laravel/framework/src/Illuminate/Routing/Route.php(260): Illuminate\Routing\ControllerDispatcher->dispatch()
#8 /www/wwwroot/Bagisto/vendor/laravel/framework/src/Illuminate/Routing/Route.php(205): Illuminate\Routing\Route->runController()
#9 /www/wwwroot/Bagisto/vendor/laravel/framework/src/Illuminate/Routing/Router.php(806): Illuminate\Routing\Route->run()
#10 /www/wwwroot/Bagisto/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(144): Illuminate\Routing\Router->Illuminate\Routing\{closure}()
#11 /www/wwwroot/Bagisto/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(119): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#12 /www/wwwroot/Bagisto/vendor/laravel/framework/src/Illuminate/Routing/Router.php(807): Illuminate\Pipeline\Pipeline->then()
#13 /www/wwwroot/Bagisto/vendor/laravel/framework/src/Illuminate/Routing/Router.php(784): Illuminate\Routing\Router->runRouteWithinStack()
#14 /www/wwwroot/Bagisto/vendor/laravel/framework/src/Illuminate/Routing/Router.php(748): Illuminate\Routing\Router->runRoute()
#15 /www/wwwroot/Bagisto/vendor/laravel/framework/src/Illuminate/Routing/Router.php(737): Illuminate\Routing\Router->dispatchToRoute()
#16 /www/wwwroot/Bagisto/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(200): Illuminate\Routing\Router->dispatch()
#17 /www/wwwroot/Bagisto/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(144): Illuminate\Foundation\Http\Kernel->Illuminate\Foundation\Http\{closure}()
#18 /www/wwwroot/Bagisto/vendor/barryvdh/laravel-debugbar/src/Middleware/InjectDebugbar.php(59): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#19 /www/wwwroot/Bagisto/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Barryvdh\Debugbar\Middleware\InjectDebugbar->handle()
#20 /www/wwwroot/Bagisto/packages/Webkul/Installer/src/Http/Middleware/CanInstall.php(31): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#21 /www/wwwroot/Bagisto/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Webkul\Installer\Http\Middleware\CanInstall->handle()
#22 /www/wwwroot/Bagisto/packages/Webkul/Core/src/Http/Middleware/SecureHeaders.php(30): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#23 /www/wwwroot/Bagisto/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Webkul\Core\Http\Middleware\SecureHeaders->handle()
#24 /www/wwwroot/Bagisto/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/TransformsRequest.php(21): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#25 /www/wwwroot/Bagisto/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/TrimStrings.php(40): Illuminate\Foundation\Http\Middleware\TransformsRequest->handle()
#26 /www/wwwroot/Bagisto/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Illuminate\Foundation\Http\Middleware\TrimStrings->handle()
#27 /www/wwwroot/Bagisto/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/ValidatePostSize.php(27): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#28 /www/wwwroot/Bagisto/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Illuminate\Foundation\Http\Middleware\ValidatePostSize->handle()
#29 /www/wwwroot/Bagisto/vendor/laravel/framework/src/Illuminate/Http/Middleware/HandleCors.php(49): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#30 /www/wwwroot/Bagisto/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Illuminate\Http\Middleware\HandleCors->handle()
#31 /www/wwwroot/Bagisto/vendor/laravel/framework/src/Illuminate/Http/Middleware/TrustProxies.php(39): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#32 /www/wwwroot/Bagisto/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(183): Illuminate\Http\Middleware\TrustProxies->handle()
#33 /www/wwwroot/Bagisto/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(119): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#34 /www/wwwroot/Bagisto/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(175): Illuminate\Pipeline\Pipeline->then()
#35 /www/wwwroot/Bagisto/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(144): Illuminate\Foundation\Http\Kernel->sendRequestThroughRouter()
#36 /www/wwwroot/Bagisto/public/index.php(56): Illuminate\Foundation\Http\Kernel->handle()
#37 {main}
"}