ErrorException: Trying to get property 'parent_id' of non-object in /var/www/html/app/Http/Controllers/NavigationController.php:45
Stack trace:
#0 /var/www/html/app/Http/Controllers/NavigationController.php(45): Illuminate\Foundation\Bootstrap\HandleExceptions->handleError(8, 'Trying to get p...', '/var/www/html/a...', 45, Array)
#1 /var/www/html/app/Http/Controllers/NavigationController.php(28): App\Http\Controllers\NavigationController->getSiteNavigationpoints()
#2 /var/www/html/app/Http/Controllers/SiteController.php(16): App\Http\Controllers\NavigationController->getNavigationLanguageVariation()
#3 [internal function]: App\Http\Controllers\SiteController->show('sitemap.xml', '')
#4 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Controller.php(54): call_user_func_array(Array, Array)
#5 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php(45): Illuminate\Routing\Controller->callAction('show', Array)
#6 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Route.php(219): Illuminate\Routing\ControllerDispatcher->dispatch(Object(Illuminate\Routing\Route), Object(App\Http\Controllers\SiteController), 'show')
#7 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Route.php(176): Illuminate\Routing\Route->runController()
#8 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Router.php(680): Illuminate\Routing\Route->run()
#9 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(30): Illuminate\Routing\Router->Illuminate\Routing\{closure}(Object(Illuminate\Http\Request))
#10 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Middleware/SubstituteBindings.php(41): Illuminate\Routing\Pipeline->Illuminate\Routing\{closure}(Object(Illuminate\Http\Request))
#11 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(163): Illuminate\Routing\Middleware\SubstituteBindings->handle(Object(Illuminate\Http\Request), Object(Closure))
#12 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(53): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#13 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/VerifyCsrfToken.php(75): Illuminate\Routing\Pipeline->Illuminate\Routing\{closure}(Object(Illuminate\Http\Request))
#14 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(163): Illuminate\Foundation\Http\Middleware\VerifyCsrfToken->handle(Object(Illuminate\Http\Request), Object(Closure))
#15 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(53): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#16 /var/www/html/vendor/laravel/framework/src/Illuminate/View/Middleware/ShareErrorsFromSession.php(49): Illuminate\Routing\Pipeline->Illuminate\Routing\{closure}(Object(Illuminate\Http\Request))
#17 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(163): Illuminate\View\Middleware\ShareErrorsFromSession->handle(Object(Illuminate\Http\Request), Object(Closure))
#18 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(53): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#19 /var/www/html/vendor/laravel/framework/src/Illuminate/Session/Middleware/StartSession.php(56): Illuminate\Routing\Pipeline->Illuminate\Routing\{closure}(Object(Illuminate\Http\Request))
#20 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(163): Illuminate\Session\Middleware\StartSession->handle(Object(Illuminate\Http\Request), Object(Closure))
#21 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(53): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#22 /var/www/html/vendor/laravel/framework/src/Illuminate/Cookie/Middleware/AddQueuedCookiesToResponse.php(37): Illuminate\Routing\Pipeline->Illuminate\Routing\{closure}(Object(Illuminate\Http\Request))
#23 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(163): Illuminate\Cookie\Middleware\AddQueuedCookiesToResponse->handle(Object(Illuminate\Http\Request), Object(Closure))
#24 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(53): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#25 /var/www/html/vendor/laravel/framework/src/Illuminate/Cookie/Middleware/EncryptCookies.php(66): Illuminate\Routing\Pipeline->Illuminate\Routing\{closure}(Object(Illuminate\Http\Request))
#26 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(163): Illuminate\Cookie\Middleware\EncryptCookies->handle(Object(Illuminate\Http\Request), Object(Closure))
#27 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(53): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#28 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(104): Illuminate\Routing\Pipeline->Illuminate\Routing\{closure}(Object(Illuminate\Http\Request))
#29 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Router.php(682): Illuminate\Pipeline\Pipeline->then(Object(Closure))
#30 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Router.php(657): Illuminate\Routing\Router->runRouteWithinStack(Object(Illuminate\Routing\Route), Object(Illuminate\Http\Request))
#31 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Router.php(623): Illuminate\Routing\Router->runRoute(Object(Illuminate\Http\Request), Object(Illuminate\Routing\Route))
#32 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Router.php(612): Illuminate\Routing\Router->dispatchToRoute(Object(Illuminate\Http\Request))
#33 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(176): Illuminate\Routing\Router->dispatch(Object(Illuminate\Http\Request))
#34 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(30): Illuminate\Foundation\Http\Kernel->Illuminate\Foundation\Http\{closure}(Object(Illuminate\Http\Request))
#35 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/TransformsRequest.php(21): Illuminate\Routing\Pipeline->Illuminate\Routing\{closure}(Object(Illuminate\Http\Request))
#36 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(163): Illuminate\Foundation\Http\Middleware\TransformsRequest->handle(Object(Illuminate\Http\Request), Object(Closure))
#37 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(53): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#38 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/TransformsRequest.php(21): Illuminate\Routing\Pipeline->Illuminate\Routing\{closure}(Object(Illuminate\Http\Request))
#39 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(163): Illuminate\Foundation\Http\Middleware\TransformsRequest->handle(Object(Illuminate\Http\Request), Object(Closure))
#40 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(53): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#41 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/ValidatePostSize.php(27): Illuminate\Routing\Pipeline->Illuminate\Routing\{closure}(Object(Illuminate\Http\Request))
#42 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(163): Illuminate\Foundation\Http\Middleware\ValidatePostSize->handle(Object(Illuminate\Http\Request), Object(Closure))
#43 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(53): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#44 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/CheckForMaintenanceMode.php(62): Illuminate\Routing\Pipeline->Illuminate\Routing\{closure}(Object(Illuminate\Http\Request))
#45 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(163): Illuminate\Foundation\Http\Middleware\CheckForMaintenanceMode->handle(Object(Illuminate\Http\Request), Object(Closure))
#46 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(53): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#47 /var/www/html/vendor/fideloper/proxy/src/TrustProxies.php(57): Illuminate\Routing\Pipeline->Illuminate\Routing\{closure}(Object(Illuminate\Http\Request))
#48 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(163): Fideloper\Proxy\TrustProxies->handle(Object(Illuminate\Http\Request), Object(Closure))
#49 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(53): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#50 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(104): Illuminate\Routing\Pipeline->Illuminate\Routing\{closure}(Object(Illuminate\Http\Request))
#51 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(151): Illuminate\Pipeline\Pipeline->then(Object(Closure))
#52 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(116): Illuminate\Foundation\Http\Kernel->sendRequestThroughRouter(Object(Illuminate\Http\Request))
#53 /var/www/html/public_html/index.php(55): Illuminate\Foundation\Http\Kernel->handle(Object(Illuminate\Http\Request))
#54 {main}<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
        <meta name="viewport" content="width=device-width, initial-scale=1">

        <title>Not Found</title>

        <!-- Fonts -->
        <link rel="dns-prefetch" href="//fonts.gstatic.com">
        <link href="https://fonts.googleapis.com/css?family=Nunito" rel="stylesheet">

        <!-- Styles -->
        <style>
            html, body {
                background-color: #fff;
                color: #636b6f;
                font-family: 'Nunito', sans-serif;
                font-weight: 100;
                height: 100vh;
                margin: 0;
            }

            .full-height {
                height: 100vh;
            }

            .flex-center {
                align-items: center;
                display: flex;
                justify-content: center;
            }

            .position-ref {
                position: relative;
            }

            .code {
                border-right: 2px solid;
                font-size: 26px;
                padding: 0 15px 0 15px;
                text-align: center;
            }

            .message {
                font-size: 18px;
                text-align: center;
            }
        </style>
    </head>
    <body>
        <div class="flex-center position-ref full-height">
            <div class="code">
                404            </div>

            <div class="message" style="padding: 10px;">
                Not Found            </div>
        </div>
    </body>
</html>