Error in Notification Backend / API

[MrKrisKrisu]

[2022-04-15 xx:xx:xx] production.ERROR: App\Http\Controllers\Backend\NotificationController::latest(): Return value must be of type Illuminate\Notifications\DatabaseNotificationCollection, Illuminate\Support\Collection returned {"userId":xxxx,"exception":"[object] (TypeError(code: 0): App\\Http\\Controllers\\Backend\\NotificationController::latest(): Return value must be of type Illuminate\\Notifications\\DatabaseNotificationCollection, Illuminate\\Support\\Collection returned at app/Http/Controllers/Backend/NotificationController.php:69)
[stacktrace]
#0 app/Http/Controllers/API/v1/NotificationsController.php(28): App\\Http\\Controllers\\Backend\\NotificationController::latest()
#1 vendor/laravel/framework/src/Illuminate/Routing/Controller.php(54): App\\Http\\Controllers\\API\\v1\\NotificationsController->index()
#2 vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php(45): Illuminate\\Routing\\Controller->callAction()
#3 vendor/laravel/framework/src/Illuminate/Routing/Route.php(261): Illuminate\\Routing\\ControllerDispatcher->dispatch()
#4 vendor/laravel/framework/src/Illuminate/Routing/Route.php(204): Illuminate\\Routing\\Route->runController()
#5 vendor/laravel/framework/src/Illuminate/Routing/Router.php(728): Illuminate\\Routing\\Route->run()
#6 vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(141): Illuminate\\Routing\\Router->Illuminate\\Routing\\{closure}()
#7 app/Http/Middleware/PrivacyPolicyInterceptionMiddleware.php(53): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#8 vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): App\\Http\\Middleware\\PrivacyPolicyInterceptionMiddleware->handle()
#9 app/Http/Middleware/ApiLogMiddleware.php(29): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#10 vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): App\\Http\\Middleware\\ApiLogMiddleware->handle()
#11 app/Http/Middleware/Api/JsonMiddleware.php(21): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#12 vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): App\\Http\\Middleware\\Api\\JsonMiddleware->handle()
#13 vendor/laravel/framework/src/Illuminate/Routing/Middleware/SubstituteBindings.php(50): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#14 vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\\Routing\\Middleware\\SubstituteBindings->handle()
#15 vendor/laravel/framework/src/Illuminate/Auth/Middleware/Authenticate.php(44): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#16 vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\\Auth\\Middleware\\Authenticate->handle()
#17 vendor/laravel/framework/src/Illuminate/Routing/Middleware/ThrottleRequests.php(126): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#18 vendor/laravel/framework/src/Illuminate/Routing/Middleware/ThrottleRequests.php(62): Illuminate\\Routing\\Middleware\\ThrottleRequests->handleRequest()
#19 vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\\Routing\\Middleware\\ThrottleRequests->handle()
#20 vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(116): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#21 vendor/laravel/framework/src/Illuminate/Routing/Router.php(730): Illuminate\\Pipeline\\Pipeline->then()
#22 vendor/laravel/framework/src/Illuminate/Routing/Router.php(705): Illuminate\\Routing\\Router->runRouteWithinStack()
#23 vendor/laravel/framework/src/Illuminate/Routing/Router.php(667): Illuminate\\Routing\\Router->runRoute()
#24 vendor/laravel/framework/src/Illuminate/Routing/Router.php(656): Illuminate\\Routing\\Router->dispatchToRoute()
#25 vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(167): Illuminate\\Routing\\Router->dispatch()
#26 vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(141): Illuminate\\Foundation\\Http\\Kernel->Illuminate\\Foundation\\Http\\{closure}()
#27 vendor/barryvdh/laravel-debugbar/src/Middleware/InjectDebugbar.php(60): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#28 vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Barryvdh\\Debugbar\\Middleware\\InjectDebugbar->handle()
#29 vendor/fruitcake/laravel-cors/src/HandleCors.php(52): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#30 vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Fruitcake\\Cors\\HandleCors->handle()
#31 vendor/laravel/framework/src/Illuminate/Http/Middleware/TrustProxies.php(39): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#32 vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\\Http\\Middleware\\TrustProxies->handle()
#33 vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/TransformsRequest.php(21): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#34 vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/ConvertEmptyStringsToNull.php(31): Illuminate\\Foundation\\Http\\Middleware\\TransformsRequest->handle()
#35 vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\\Foundation\\Http\\Middleware\\ConvertEmptyStringsToNull->handle()
#36 vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/TransformsRequest.php(21): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#37 vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/TrimStrings.php(40): Illuminate\\Foundation\\Http\\Middleware\\TransformsRequest->handle()
#38 vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\\Foundation\\Http\\Middleware\\TrimStrings->handle()
#39 vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/ValidatePostSize.php(27): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#40 vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\\Foundation\\Http\\Middleware\\ValidatePostSize->handle()
#41 vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/PreventRequestsDuringMaintenance.php(86): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#42 vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\\Foundation\\Http\\Middleware\\PreventRequestsDuringMaintenance->handle()
#43 vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(116): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#44 vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(142): Illuminate\\Pipeline\\Pipeline->then()
#45 vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(111): Illuminate\\Foundation\\Http\\Kernel->sendRequestThroughRouter()
#46 public/index.php(61): Illuminate\\Foundation\\Http\\Kernel->handle()
#47 {main}
"}