Trying to get property 'CategoryName' of non-object

(1/1) ErrorException

Trying to get property 'CategoryName' of non-object

in Site.php line 78
at HandleExceptions->handleError(8, 'Trying to get property \'CategoryName\' of non-object', '/home/dh_dx8iry/sifamtly.org/app/Http/Controllers/Site.php', 78, array('req' => object(Request), 'course_category_id' => 'about.html', 'data' => array('CategoryId' => 'about.html')))in Site.php line 78
at Site->view_course(object(Request), 'about.html')
at call_user_func_array(array(object(Site), 'view_course'), array(object(Request), 'RegistrationType' => 'about.html'))in Controller.php line 54
at Controller->callAction('view_course', array(object(Request), 'RegistrationType' => 'about.html'))in ControllerDispatcher.php line 45
at ControllerDispatcher->dispatch(object(Route), object(Site), 'view_course')in Route.php line 219
at Route->runController()in Route.php line 176
at Route->run()in Router.php line 681
at Router->Illuminate\Routing\{closure}(object(Request))in Pipeline.php line 130
at Pipeline->Illuminate\Pipeline\{closure}(object(Request))in SubstituteBindings.php line 41
at SubstituteBindings->handle(object(Request), object(Closure))in Pipeline.php line 171
at Pipeline->Illuminate\Pipeline\{closure}(object(Request))in VerifyCsrfToken.php line 76
at VerifyCsrfToken->handle(object(Request), object(Closure))in Pipeline.php line 171
at Pipeline->Illuminate\Pipeline\{closure}(object(Request))in ShareErrorsFromSession.php line 49
at ShareErrorsFromSession->handle(object(Request), object(Closure))in Pipeline.php line 171
at Pipeline->Illuminate\Pipeline\{closure}(object(Request))in StartSession.php line 56
at StartSession->handle(object(Request), object(Closure))in Pipeline.php line 171
at Pipeline->Illuminate\Pipeline\{closure}(object(Request))in AddQueuedCookiesToResponse.php line 37
at AddQueuedCookiesToResponse->handle(object(Request), object(Closure))in Pipeline.php line 171
at Pipeline->Illuminate\Pipeline\{closure}(object(Request))in EncryptCookies.php line 66
at EncryptCookies->handle(object(Request), object(Closure))in Pipeline.php line 171
at Pipeline->Illuminate\Pipeline\{closure}(object(Request))in Pipeline.php line 105
at Pipeline->then(object(Closure))in Router.php line 683
at Router->runRouteWithinStack(object(Route), object(Request))in Router.php line 658
at Router->runRoute(object(Request), object(Route))in Router.php line 624
at Router->dispatchToRoute(object(Request))in Router.php line 613
at Router->dispatch(object(Request))in Kernel.php line 170
at Kernel->Illuminate\Foundation\Http\{closure}(object(Request))in Pipeline.php line 130
at Pipeline->Illuminate\Pipeline\{closure}(object(Request))in TransformsRequest.php line 21
at TransformsRequest->handle(object(Request), object(Closure))in Pipeline.php line 171
at Pipeline->Illuminate\Pipeline\{closure}(object(Request))in TransformsRequest.php line 21
at TransformsRequest->handle(object(Request), object(Closure))in Pipeline.php line 171
at Pipeline->Illuminate\Pipeline\{closure}(object(Request))in ValidatePostSize.php line 27
at ValidatePostSize->handle(object(Request), object(Closure))in Pipeline.php line 171
at Pipeline->Illuminate\Pipeline\{closure}(object(Request))in CheckForMaintenanceMode.php line 63
at CheckForMaintenanceMode->handle(object(Request), object(Closure))in Pipeline.php line 171
at Pipeline->Illuminate\Pipeline\{closure}(object(Request))in TrustProxies.php line 57
at TrustProxies->handle(object(Request), object(Closure))in Pipeline.php line 171
at Pipeline->Illuminate\Pipeline\{closure}(object(Request))in Pipeline.php line 105
at Pipeline->then(object(Closure))in Kernel.php line 145
at Kernel->sendRequestThroughRouter(object(Request))in Kernel.php line 110
at Kernel->handle(object(Request))in index.php line 55