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(1/1) ErrorException

Trying to get property of non-object

in ArticleController.php (line 146)
at HandleExceptions->handleError(8, 'Trying to get property of non-object', '/data/wwwroot/www.xuebiancheng.cn/app/Http/Controllers/Article/ArticleController.php', 146, array('category' => null))in ArticleController.php (line 146)
at ArticleController->App\Http\Controllers\Article\{closure}()in Repository.php (line 288)
at Repository->remember('activeIds_app', 37, object(Closure))in CacheManager.php (line 302)
at CacheManager->__call('remember', array('activeIds_app', 37, object(Closure)))in Facade.php (line 221)
at Facade::__callStatic('remember', array('activeIds_app', 37, object(Closure)))in ArticleController.php (line 155)
at ArticleController->category(object(Request), 'app')
at call_user_func_array(array(object(ArticleController), 'category'), array(object(Request), 'code' => 'app'))in Controller.php (line 55)
at Controller->callAction('category', array(object(Request), 'code' => 'app'))in ControllerDispatcher.php (line 44)
at ControllerDispatcher->dispatch(object(Route), object(ArticleController), 'category')in Route.php (line 203)
at Route->runController()in Route.php (line 160)
at Route->run()in Router.php (line 574)
at Router->Illuminate\Routing\{closure}(object(Request))in Pipeline.php (line 30)
at Pipeline->Illuminate\Routing\{closure}(object(Request))in SubstituteBindings.php (line 41)
at SubstituteBindings->handle(object(Request), object(Closure))in Pipeline.php (line 148)
at Pipeline->Illuminate\Pipeline\{closure}(object(Request))in Pipeline.php (line 53)
at Pipeline->Illuminate\Routing\{closure}(object(Request))in VerifyCsrfToken.php (line 65)
at VerifyCsrfToken->handle(object(Request), object(Closure))in Pipeline.php (line 148)
at Pipeline->Illuminate\Pipeline\{closure}(object(Request))in Pipeline.php (line 53)
at Pipeline->Illuminate\Routing\{closure}(object(Request))in ShareErrorsFromSession.php (line 49)
at ShareErrorsFromSession->handle(object(Request), object(Closure))in Pipeline.php (line 148)
at Pipeline->Illuminate\Pipeline\{closure}(object(Request))in Pipeline.php (line 53)
at Pipeline->Illuminate\Routing\{closure}(object(Request))in StartSession.php (line 64)
at StartSession->handle(object(Request), object(Closure))in Pipeline.php (line 148)
at Pipeline->Illuminate\Pipeline\{closure}(object(Request))in Pipeline.php (line 53)
at Pipeline->Illuminate\Routing\{closure}(object(Request))in AddQueuedCookiesToResponse.php (line 37)
at AddQueuedCookiesToResponse->handle(object(Request), object(Closure))in Pipeline.php (line 148)
at Pipeline->Illuminate\Pipeline\{closure}(object(Request))in Pipeline.php (line 53)
at Pipeline->Illuminate\Routing\{closure}(object(Request))in EncryptCookies.php (line 59)
at EncryptCookies->handle(object(Request), object(Closure))in Pipeline.php (line 148)
at Pipeline->Illuminate\Pipeline\{closure}(object(Request))in Pipeline.php (line 53)
at Pipeline->Illuminate\Routing\{closure}(object(Request))in Pipeline.php (line 102)
at Pipeline->then(object(Closure))in Router.php (line 576)
at Router->runRouteWithinStack(object(Route), object(Request))in Router.php (line 535)
at Router->dispatchToRoute(object(Request))in Router.php (line 513)
at Router->dispatch(object(Request))in Kernel.php (line 174)
at Kernel->Illuminate\Foundation\Http\{closure}(object(Request))in Pipeline.php (line 30)
at Pipeline->Illuminate\Routing\{closure}(object(Request))in TransformsRequest.php (line 30)
at TransformsRequest->handle(object(Request), object(Closure))in Pipeline.php (line 148)
at Pipeline->Illuminate\Pipeline\{closure}(object(Request))in Pipeline.php (line 53)
at Pipeline->Illuminate\Routing\{closure}(object(Request))in TransformsRequest.php (line 30)
at TransformsRequest->handle(object(Request), object(Closure))in Pipeline.php (line 148)
at Pipeline->Illuminate\Pipeline\{closure}(object(Request))in Pipeline.php (line 53)
at Pipeline->Illuminate\Routing\{closure}(object(Request))in ValidatePostSize.php (line 27)
at ValidatePostSize->handle(object(Request), object(Closure))in Pipeline.php (line 148)
at Pipeline->Illuminate\Pipeline\{closure}(object(Request))in Pipeline.php (line 53)
at Pipeline->Illuminate\Routing\{closure}(object(Request))in CheckForMaintenanceMode.php (line 46)
at CheckForMaintenanceMode->handle(object(Request), object(Closure))in Pipeline.php (line 148)
at Pipeline->Illuminate\Pipeline\{closure}(object(Request))in Pipeline.php (line 53)
at Pipeline->Illuminate\Routing\{closure}(object(Request))in Pipeline.php (line 102)
at Pipeline->then(object(Closure))in Kernel.php (line 149)
at Kernel->sendRequestThroughRouter(object(Request))in Kernel.php (line 116)
at Kernel->handle(object(Request))in index.php (line 53)