[2020-10-17 16:34:59] local.ERROR: Call to a member function has() on null {"exception":"[object] (Symfony\\Component\\Debug\\Exception\\FatalThrowableError(code: 0): Call to a member function has() on null at /var/www/vendor/backpack/crud/src/PanelTraits/Query.php:54)
[stacktrace]
#0 /var/www/app/Http/Controllers/Admin/CategoryCrudController.php(35): Backpack\\CRUD\\CrudPanel->orderBy('lft')
#1 [internal function]: App\\Http\\Controllers\\Admin\\CategoryCrudController->__construct()
#2 /var/www/vendor/laravel/framework/src/Illuminate/Container/Container.php(825): ReflectionClass->newInstanceArgs(Array)
#3 /var/www/vendor/laravel/framework/src/Illuminate/Container/Container.php(667): Illuminate\\Container\\Container->build('App\\\\Http\\\\Contro...')
#4 /var/www/vendor/laravel/framework/src/Illuminate/Container/Container.php(615): Illuminate\\Container\\Container->resolve('App\\\\Http\\\\Contro...', Array)
#5 /var/www/vendor/laravel/framework/src/Illuminate/Foundation/Application.php(767): Illuminate\\Container\\Container->make('App\\\\Http\\\\Contro...', Array)
#6 /var/www/vendor/laravel/framework/src/Illuminate/Routing/Route.php(233): Illuminate\\Foundation\\Application->make('App\\\\Http\\\\Contro...')
#7 /var/www/vendor/laravel/framework/src/Illuminate/Routing/Route.php(833): Illuminate\\Routing\\Route->getController()
#8 /var/www/vendor/laravel/framework/src/Illuminate/Routing/Route.php(794): Illuminate\\Routing\\Route->controllerMiddleware()
#9 /var/www/vendor/laravel/framework/src/Illuminate/Routing/Router.php(693): Illuminate\\Routing\\Route->gatherMiddleware()
#10 /var/www/vendor/laravel/framework/src/Illuminate/Routing/Router.php(673): Illuminate\\Routing\\Router->gatherRouteMiddleware(Object(Illuminate\\Routing\\Route))
#11 /var/www/vendor/laravel/framework/src/Illuminate/Routing/Router.php(657): Illuminate\\Routing\\Router->runRouteWithinStack(Object(Illuminate\\Routing\\Route), Object(Illuminate\\Http\\Request))
#12 /var/www/vendor/laravel/framework/src/Illuminate/Routing/Router.php(623): Illuminate\\Routing\\Router->runRoute(Object(Illuminate\\Http\\Request), Object(Illuminate\\Routing\\Route))
#13 /var/www/vendor/laravel/framework/src/Illuminate/Routing/Router.php(612): Illuminate\\Routing\\Router->dispatchToRoute(Object(Illuminate\\Http\\Request))
#14 /var/www/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(176): Illuminate\\Routing\\Router->dispatch(Object(Illuminate\\Http\\Request))
#15 /var/www/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(30): Illuminate\\Foundation\\Http\\Kernel->Illuminate\\Foundation\\Http\\{closure}(Object(Illuminate\\Http\\Request))
#16 /var/www/vendor/barryvdh/laravel-cors/src/HandleCors.php(36): Illuminate\\Routing\\Pipeline->Illuminate\\Routing\\{closure}(Object(Illuminate\\Http\\Request))
#17 /var/www/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(163): Barryvdh\\Cors\\HandleCors->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#18 /var/www/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(53): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#19 /var/www/vendor/fideloper/proxy/src/TrustProxies.php(57): Illuminate\\Routing\\Pipeline->Illuminate\\Routing\\{closure}(Object(Illuminate\\Http\\Request))
#20 /var/www/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(163): Fideloper\\Proxy\\TrustProxies->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#21 /var/www/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(53): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#22 /var/www/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/TransformsRequest.php(21): Illuminate\\Routing\\Pipeline->Illuminate\\Routing\\{closure}(Object(Illuminate\\Http\\Request))
#23 /var/www/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(163): Illuminate\\Foundation\\Http\\Middleware\\TransformsRequest->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#24 /var/www/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(53): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#25 /var/www/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/TransformsRequest.php(21): Illuminate\\Routing\\Pipeline->Illuminate\\Routing\\{closure}(Object(Illuminate\\Http\\Request))
#26 /var/www/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(163): Illuminate\\Foundation\\Http\\Middleware\\TransformsRequest->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#27 /var/www/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(53): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#28 /var/www/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/ValidatePostSize.php(27): Illuminate\\Routing\\Pipeline->Illuminate\\Routing\\{closure}(Object(Illuminate\\Http\\Request))
#29 /var/www/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(163): Illuminate\\Foundation\\Http\\Middleware\\ValidatePostSize->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#30 /var/www/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(53): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#31 /var/www/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/CheckForMaintenanceMode.php(62): Illuminate\\Routing\\Pipeline->Illuminate\\Routing\\{closure}(Object(Illuminate\\Http\\Request))
#32 /var/www/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(163): Illuminate\\Foundation\\Http\\Middleware\\CheckForMaintenanceMode->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#33 /var/www/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(53): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#34 /var/www/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(104): Illuminate\\Routing\\Pipeline->Illuminate\\Routing\\{closure}(Object(Illuminate\\Http\\Request))
#35 /var/www/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(151): Illuminate\\Pipeline\\Pipeline->then(Object(Closure))
#36 /var/www/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(116): Illuminate\\Foundation\\Http\\Kernel->sendRequestThroughRouter(Object(Illuminate\\Http\\Request))
#37 /var/www/public/index.php(55): Illuminate\\Foundation\\Http\\Kernel->handle(Object(Illuminate\\Http\\Request))
#38 {main}
"}