diff --git a/src/app/Http/Controllers/API/V4/SkusController.php b/src/app/Http/Controllers/API/V4/SkusController.php
index bfc551a0..f18eb5bb 100644
--- a/src/app/Http/Controllers/API/V4/SkusController.php
+++ b/src/app/Http/Controllers/API/V4/SkusController.php
@@ -1,185 +1,193 @@
 <?php
 
 namespace App\Http\Controllers\API\V4;
 
 use App\Http\Controllers\Controller;
 use App\Sku;
 use Illuminate\Http\Request;
 use Illuminate\Support\Facades\Auth;
 
 class SkusController extends Controller
 {
     /**
      * Show the form for creating a new sku.
      *
      * @return \Illuminate\Http\JsonResponse
      */
     public function create()
     {
         // TODO
         return $this->errorResponse(404);
     }
 
     /**
      * Remove the specified sku from storage.
      *
      * @param int $id SKU identifier
      *
      * @return \Illuminate\Http\JsonResponse
      */
     public function destroy($id)
     {
         // TODO
         return $this->errorResponse(404);
     }
 
     /**
      * Show the form for editing the specified sku.
      *
      * @param int $id SKU identifier
      *
      * @return \Illuminate\Http\JsonResponse
      */
     public function edit($id)
     {
         // TODO
         return $this->errorResponse(404);
     }
 
     /**
      * Get a list of active SKUs.
      *
      * @return \Illuminate\Http\JsonResponse
      */
     public function index()
     {
         // Note: Order by title for consistent ordering in tests
         $skus = Sku::where('active', true)->orderBy('title')->get();
 
         $response = [];
 
         foreach ($skus as $sku) {
             if ($data = $this->skuElement($sku)) {
                 $response[] = $data;
             }
         }
 
         usort($response, function ($a, $b) {
             return ($b['prio'] <=> $a['prio']);
         });
 
         return response()->json($response);
     }
 
     /**
      * Store a newly created sku in storage.
      *
      * @param \Illuminate\Http\Request $request
      *
      * @return \Illuminate\Http\JsonResponse
      */
     public function store(Request $request)
     {
         // TODO
         return $this->errorResponse(404);
     }
 
     /**
      * Display the specified sku.
      *
      * @param int $id SKU identifier
      *
      * @return \Illuminate\Http\JsonResponse
      */
     public function show($id)
     {
         // TODO
         return $this->errorResponse(404);
     }
 
     /**
      * Update the specified sku in storage.
      *
      * @param \Illuminate\Http\Request $request Request object
      * @param int                      $id      SKU identifier
      *
      * @return \Illuminate\Http\JsonResponse
      */
     public function update(Request $request, $id)
     {
         // TODO
         return $this->errorResponse(404);
     }
 
     /**
      * Get a list of SKUs available to the user.
      *
      * @param int $id User identifier
      *
      * @return \Illuminate\Http\JsonResponse
      */
     public function userSkus($id)
     {
         $user = \App\User::find($id);
 
         if (empty($user)) {
             return $this->errorResponse(404);
         }
 
         if (!Auth::guard()->user()->canRead($user)) {
             return $this->errorResponse(403);
         }
 
         $type = request()->input('type');
         $response = [];
 
         // Note: Order by title for consistent ordering in tests
         $skus = Sku::orderBy('title')->get();
 
         foreach ($skus as $sku) {
+            if (!class_exists($sku->handler_class)) {
+                continue;
+            }
+
             if (!$sku->handler_class::isAvailable($sku, $user)) {
                 continue;
             }
 
             if ($data = $this->skuElement($sku)) {
                 if ($type && $type != $data['type']) {
                     continue;
                 }
 
                 $response[] = $data;
             }
         }
 
         usort($response, function ($a, $b) {
             return ($b['prio'] <=> $a['prio']);
         });
 
         return response()->json($response);
     }
 
     /**
      * Convert SKU information to metadata used by UI to
      * display the form control
      *
      * @param \App\Sku $sku SKU object
      *
      * @return array|null Metadata
      */
     protected function skuElement($sku): ?array
     {
+        if (!class_exists($sku->handler_class)) {
+            return null;
+        }
+
         $data = array_merge($sku->toArray(), $sku->handler_class::metadata($sku));
 
         // ignore incomplete handlers
         if (empty($data['type'])) {
             return null;
         }
 
         // Use localized value, toArray() does not get them right
         $data['name'] = $sku->name;
         $data['description'] = $sku->description;
 
         unset($data['handler_class'], $data['created_at'], $data['updated_at']);
 
         return $data;
     }
 }