Custom error handler problems

[fico7489]

I have this code in AppServiceProvider:

   $exception->register(function(ModelNotFoundException $e) {
        return \Response::make([]);
    });

And I am getting error :

{
  "message": "Call to a member function requestIsConditional() on null",
  "status_code": 500,
  "debug": {
    "line": 653,
    "file": "/home/vagrant/green-rush/vendor/dingo/api/src/Routing/Router.php",
    "class": "Symfony\\Component\\Debug\\Exception\\FatalThrowableError",
    "trace": [
      "#0 /home/vagrant/green-rush/vendor/dingo/api/src/Routing/Router.php(623): Dingo\\Api\\Routing\\Router->requestIsConditional()",
      "#1 /home/vagrant/green-rush/vendor/dingo/api/src/Routing/Router.php(589): Dingo\\Api\\Routing\\Router->prepareResponse(Object(Dingo\\Api\\Http\\Response), Object(Dingo\\Api\\Http\\Request), 'json')",
      "#2 /home/vagrant/green-rush/vendor/dingo/api/src/Http/Middleware/Request.php(123): Dingo\\Api\\Routing\\Router->dispatch(Object(Dingo\\Api\\Http\\Request))",
      "#3 [internal function]: Dingo\\Api\\Http\\Middleware\\Request->Dingo\\Api\\Http\\Middleware\\{closure}(Object(Dingo\\Api\\Http\\Request))",
      "#4 /home/vagrant/green-rush/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(150): call_user_func(Object(Closure), Object(Dingo\\Api\\Http\\Request))",
      "#5 /home/vagrant/green-rush/vendor/barryvdh/laravel-debugbar/src/Middleware/Debugbar.php(51): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Dingo\\Api\\Http\\Request))",
      "#6 [internal function]: Barryvdh\\Debugbar\\Middleware\\Debugbar->handle(Object(Dingo\\Api\\Http\\Request), Object(Closure))",
      "#7 /home/vagrant/green-rush/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(136): call_user_func_array(Array, Array)",
      "#8 /home/vagrant/green-rush/vendor/fideloper/proxy/src/TrustProxies.php(41): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Dingo\\Api\\Http\\Request))",
      "#9 [internal function]: Fideloper\\Proxy\\TrustProxies->handle(Object(Dingo\\Api\\Http\\Request), Object(Closure))",
      "#10 /home/vagrant/green-rush/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(136): call_user_func_array(Array, Array)",
      "#11 /home/vagrant/green-rush/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/CheckForMaintenanceMode.php(44): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Dingo\\Api\\Http\\Request))",
      "#12 [internal function]: Illuminate\\Foundation\\Http\\Middleware\\CheckForMaintenanceMode->handle(Object(Dingo\\Api\\Http\\Request), Object(Closure))",
      "#13 /home/vagrant/green-rush/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(136): call_user_func_array(Array, Array)",
      "#14 [internal function]: Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Dingo\\Api\\Http\\Request))",
      "#15 /home/vagrant/green-rush/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(102): call_user_func(Object(Closure), Object(Dingo\\Api\\Http\\Request))",
      "#16 /home/vagrant/green-rush/vendor/dingo/api/src/Http/Middleware/Request.php(124): Illuminate\\Pipeline\\Pipeline->then(Object(Closure))",
      "#17 /home/vagrant/green-rush/vendor/dingo/api/src/Http/Middleware/Request.php(100): Dingo\\Api\\Http\\Middleware\\Request->sendRequestThroughRouter(Object(Dingo\\Api\\Http\\Request))",
      "#18 [internal function]: Dingo\\Api\\Http\\Middleware\\Request->handle(Object(Dingo\\Api\\Http\\Request), Object(Closure))",
      "#19 /home/vagrant/green-rush/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(136): call_user_func_array(Array, Array)",
      "#20 [internal function]: Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))",
      "#21 /home/vagrant/green-rush/vendor/laravel/framework/src/Illuminate/Routing/Pipeline.php(32): call_user_func(Object(Closure), Object(Illuminate\\Http\\Request))",
      "#22 [internal function]: Illuminate\\Routing\\Pipeline->Illuminate\\Routing\\{closure}(Object(Illuminate\\Http\\Request))",
      "#23 /home/vagrant/green-rush/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(102): call_user_func(Object(Closure), Object(Illuminate\\Http\\Request))",
      "#24 /home/vagrant/green-rush/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(132): Illuminate\\Pipeline\\Pipeline->then(Object(Closure))",
      "#25 /home/vagrant/green-rush/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(99): Illuminate\\Foundation\\Http\\Kernel->sendRequestThroughRouter(Object(Illuminate\\Http\\Request))",
      "#26 /home/vagrant/green-rush/public/index.php(53): Illuminate\\Foundation\\Http\\Kernel->handle(Object(Illuminate\\Http\\Request))",
      "#27 {main}"
    ]
  }
}

But this works fine:

 $exception->register(function(ModelNotFoundException $e) {
        return 'error';
    });

In your documentation you are returning like:

app('Dingo\Api\Exception\Handler')->register(function (Symfony\Component\HttpKernel\Exception\UnauthorizedHttpException $exception) {
    return Response::make(['error' => 'Hey, what do you think you are doing!?'], 401);
});

[shibby]

getting same issue.
i've handled HttpException.
app(Handler::class)->register(function (HttpException $exception) { .....

if endpoint is not exists, getting exact same error.