Attempt to read property "id" on null

ErrorException: Attempt to read property "id" on null in file /var/www/html/app/Http/Controllers/Api/MHelpCenterController.php on line 74 #0 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php(259): Illuminate\Foundation\Bootstrap\HandleExceptions->handleError(2, 'Attempt to read...', '/var/www/html/a...', 74) #1 /var/www/html/app/Http/Controllers/Api/MHelpCenterController.php(74): Illuminate\Foundation\Bootstrap\HandleExceptions->Illuminate\Foundation\Bootstrap\{closure}(2, 'Attempt to read...', '/var/www/html/a...', 74) #2 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Controller.php(54): App\Http\Controllers\Api\MHelpCenterController->getByCategory(Object(Illuminate\Http\Request), 7) #3 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php(45): Illuminate\Routing\Controller->callAction('getByCategory', Array) #4 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Route.php(261): Illuminate\Routing\ControllerDispatcher->dispatch(Object(Illuminate\Routing\Route), Object(App\Http\Controllers\Api\MHelpCenterController), 'getByCategory') #5 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Route.php(204): Illuminate\Routing\Route->runController() #6 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Router.php(725): Illuminate\Routing\Route->run() #7 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(141): Illuminate\Routing\Router->Illuminate\Routing\{closure}(Object(Illuminate\Http\Request)) #8 /var/www/html/app/Http/Middleware/VerifyApiKey.php(38): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request)) #9 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): App\Http\Middleware\VerifyApiKey->handle(Object(Illuminate\Http\Request), Object(Closure)) #10 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Middleware/SubstituteBindings.php(50): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request)) #11 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\Routing\Middleware\SubstituteBindings->handle(Object(Illuminate\Http\Request), Object(Closure)) #12 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Middleware/ThrottleRequests.php(126): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request)) #13 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Middleware/ThrottleRequests.php(102): Illuminate\Routing\Middleware\ThrottleRequests->handleRequest(Object(Illuminate\Http\Request), Object(Closure), Array) #14 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Middleware/ThrottleRequests.php(54): Illuminate\Routing\Middleware\ThrottleRequests->handleRequestUsingNamedLimiter(Object(Illuminate\Http\Request), Object(Closure), 'api', Object(Closure)) #15 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\Routing\Middleware\ThrottleRequests->handle(Object(Illuminate\Http\Request), Object(Closure), 'api') #16 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(116): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request)) #17 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Router.php(726): Illuminate\Pipeline\Pipeline->then(Object(Closure)) #18 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Router.php(703): Illuminate\Routing\Router->runRouteWithinStack(Object(Illuminate\Routing\Route), Object(Illuminate\Http\Request)) #19 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Router.php(667): Illuminate\Routing\Router->runRoute(Object(Illuminate\Http\Request), Object(Illuminate\Routing\Route)) #20 /var/www/html/vendor/laravel/framework/src/Illuminate/Routing/Router.php(656): Illuminate\Routing\Router->dispatchToRoute(Object(Illuminate\Http\Request)) #21 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(189): Illuminate\Routing\Router->dispatch(Object(Illuminate\Http\Request)) #22 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(141): Illuminate\Foundation\Http\Kernel->Illuminate\Foundation\Http\{closure}(Object(Illuminate\Http\Request)) #23 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/TransformsRequest.php(21): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request)) #24 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/ConvertEmptyStringsToNull.php(31): Illuminate\Foundation\Http\Middleware\TransformsRequest->handle(Object(Illuminate\Http\Request), Object(Closure)) #25 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\Foundation\Http\Middleware\ConvertEmptyStringsToNull->handle(Object(Illuminate\Http\Request), Object(Closure)) #26 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/TransformsRequest.php(21): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request)) #27 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/TrimStrings.php(40): Illuminate\Foundation\Http\Middleware\TransformsRequest->handle(Object(Illuminate\Http\Request), Object(Closure)) #28 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\Foundation\Http\Middleware\TrimStrings->handle(Object(Illuminate\Http\Request), Object(Closure)) #29 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/ValidatePostSize.php(27): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request)) #30 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\Foundation\Http\Middleware\ValidatePostSize->handle(Object(Illuminate\Http\Request), Object(Closure)) #31 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/PreventRequestsDuringMaintenance.php(86): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request)) #32 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\Foundation\Http\Middleware\PreventRequestsDuringMaintenance->handle(Object(Illuminate\Http\Request), Object(Closure)) #33 /var/www/html/vendor/laravel/framework/src/Illuminate/Http/Middleware/HandleCors.php(62): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request)) #34 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\Http\Middleware\HandleCors->handle(Object(Illuminate\Http\Request), Object(Closure)) #35 /var/www/html/vendor/laravel/framework/src/Illuminate/Http/Middleware/TrustProxies.php(39): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request)) #36 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\Http\Middleware\TrustProxies->handle(Object(Illuminate\Http\Request), Object(Closure)) #37 /var/www/html/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(116): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request)) #38 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(164): Illuminate\Pipeline\Pipeline->then(Object(Closure)) #39 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(133): Illuminate\Foundation\Http\Kernel->sendRequestThroughRouter(Object(Illuminate\Http\Request)) #40 /var/www/html/index.php(52): Illuminate\Foundation\Http\Kernel->handle(Object(Illuminate\Http\Request)) #41 {main}

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