diff --git a/src/Http/Controllers/Admin/AppSettingsController.php b/src/Http/Controllers/Admin/AppSettingsController.php
index 6e4689331..18d104063 100644
--- a/src/Http/Controllers/Admin/AppSettingsController.php
+++ b/src/Http/Controllers/Admin/AppSettingsController.php
@@ -33,7 +33,7 @@ protected function setUpController(): void
         }
     }
 
-    public function update(int|string|TwillModelContract $id, ?int $submoduleId = null): JsonResponse
+    public function update(int|string|TwillModelContract $id, int|string|null $submoduleId = null): JsonResponse
     {
         $model = AppSetting::findOrFail($id);
 
diff --git a/src/Http/Controllers/Admin/FileLibraryController.php b/src/Http/Controllers/Admin/FileLibraryController.php
index e04eeb40e..a315a00fb 100644
--- a/src/Http/Controllers/Admin/FileLibraryController.php
+++ b/src/Http/Controllers/Admin/FileLibraryController.php
@@ -106,7 +106,7 @@ public function filters(): TableFilters
         ]);
     }
 
-    public function index(?int $parentModuleId = null): mixed
+    public function index(int|string|null $parentModuleId = null): mixed
     {
         if ($this->request->has('except')) {
             $prependScope['exceptIds'] = $this->request->get('except');
@@ -172,7 +172,7 @@ protected function getRequestFilters(): array
     }
 
     /**
-     * @param int|null $parentModuleId
+     * @param int|string|null $parentModuleId
      * @return JsonResponse
      * @throws BindingResolutionException
      */
diff --git a/src/Http/Controllers/Admin/GroupController.php b/src/Http/Controllers/Admin/GroupController.php
index f9ecdd0b9..503225500 100644
--- a/src/Http/Controllers/Admin/GroupController.php
+++ b/src/Http/Controllers/Admin/GroupController.php
@@ -100,7 +100,7 @@ public function edit(int|string|TwillModelContract $id): mixed
         return parent::edit($id);
     }
 
-    public function update(int|string|TwillModelContract $id, ?int $submoduleId = null): JsonResponse
+    public function update(int|string|TwillModelContract $id, int|string|null $submoduleId = null): JsonResponse
     {
         $this->authorizableOptions['edit'] = 'edit-group';
 
diff --git a/src/Http/Controllers/Admin/MediaLibraryController.php b/src/Http/Controllers/Admin/MediaLibraryController.php
index 84c1ae2e2..e0bc6933a 100644
--- a/src/Http/Controllers/Admin/MediaLibraryController.php
+++ b/src/Http/Controllers/Admin/MediaLibraryController.php
@@ -106,7 +106,7 @@ public function filters(): TableFilters
         ]);
     }
 
-    public function index(?int $parentModuleId = null): array
+    public function index(int|string|null $parentModuleId = null): array
     {
         if ($this->request->has('except')) {
             $prependScope['exceptIds'] = $this->request->get('except');
@@ -150,7 +150,7 @@ protected function getRequestFilters(): array
     }
 
     /**
-     * @param int|null $parentModuleId
+     * @param int|string|null $parentModuleId
      * @return
      */
     public function store($parentModuleId = null)
diff --git a/src/Http/Controllers/Admin/ModuleController.php b/src/Http/Controllers/Admin/ModuleController.php
index fdd1c5e87..43851c804 100644
--- a/src/Http/Controllers/Admin/ModuleController.php
+++ b/src/Http/Controllers/Admin/ModuleController.php
@@ -259,7 +259,7 @@ abstract class ModuleController extends Controller
     protected $submodule = false;
 
     /**
-     * @var int|null
+     * @var int|string|null
      */
     protected $submoduleParentId = null;
 
@@ -970,7 +970,7 @@ protected function getParentModuleIdFromRequest(Request $request)
     /**
      * @return IlluminateView|JsonResponse
      */
-    public function index(?int $parentModuleId = null): mixed
+    public function index(int|string|null $parentModuleId = null): mixed
     {
         $this->authorizeOption('list', $this->moduleName);
 
@@ -1032,7 +1032,7 @@ public function browser(): JsonResponse
     }
 
     /**
-     * @param int|null $parentModuleId
+     * @param int|string|null $parentModuleId
      * @return \Illuminate\Http\JsonResponse
      */
     public function store($parentModuleId = null)
@@ -1093,7 +1093,7 @@ public function store($parentModuleId = null)
     /**
      * @param Request $request
      * @param int|string $id
-     * @param int|null $submoduleId
+     * @param int|string|null $submoduleId
      * @return \Illuminate\Http\RedirectResponse
      */
     public function show($id, $submoduleId = null)
@@ -1169,7 +1169,7 @@ public function edit(TwillModelContract|int|string $id): mixed
         );
     }
 
-    public function create(int $parentModuleId = null): JsonResponse|RedirectResponse|IlluminateView
+    public function create(int|string $parentModuleId = null): JsonResponse|RedirectResponse|IlluminateView
     {
         if (! $this->getIndexOption('skipCreateModal')) {
             return Redirect::to(
@@ -1205,7 +1205,7 @@ public function create(int $parentModuleId = null): JsonResponse|RedirectRespons
         );
     }
 
-    public function update(int|string|TwillModelContract $id, ?int $submoduleId = null): JsonResponse
+    public function update(int|string|TwillModelContract $id, int|string|null $submoduleId = null): JsonResponse
     {
         [$item, $id] = $this->itemAndIdFromRequest($id);
 
@@ -1435,7 +1435,7 @@ public function bulkPublish(): JsonResponse
         );
     }
 
-    public function duplicate(int|string|TwillModelContract $id, ?int $submoduleId = null): JsonResponse
+    public function duplicate(int|string|TwillModelContract $id, int|string|null $submoduleId = null): JsonResponse
     {
         [$item, $id] = $this->itemAndIdFromRequest($id);
 
@@ -1475,7 +1475,7 @@ public function duplicate(int|string|TwillModelContract $id, ?int $submoduleId =
         );
     }
 
-    public function destroy(int|string|TwillModelContract $id, ?int $submoduleId = null): JsonResponse
+    public function destroy(int|string|TwillModelContract $id, int|string|null $submoduleId = null): JsonResponse
     {
         [$item, $id] = $this->itemAndIdFromRequest($id);
 
diff --git a/src/Http/Controllers/Admin/RoleController.php b/src/Http/Controllers/Admin/RoleController.php
index 70d0f125b..9bd54c71e 100644
--- a/src/Http/Controllers/Admin/RoleController.php
+++ b/src/Http/Controllers/Admin/RoleController.php
@@ -87,7 +87,7 @@ protected function indexItemData($item): array
         return ['edit' => $canEdit ? $this->getModuleRoute($item->id, 'edit') : null];
     }
 
-    public function index(?int $parentModuleId = null): mixed
+    public function index(int|string|null $parentModuleId = null): mixed
     {
         // Superadmins can reorder groups to determine the access-level of each one.
         // A given group can't edit other groups with a higher access-level.
@@ -103,7 +103,7 @@ public function edit(int|string|TwillModelContract $id): mixed
         return parent::edit($id);
     }
 
-    public function update(int|string|TwillModelContract $id, ?int $submoduleId = null): JsonResponse
+    public function update(int|string|TwillModelContract $id, int|string|null $submoduleId = null): JsonResponse
     {
         $this->authorizableOptions['edit'] = 'edit-role';
 
diff --git a/src/Http/Controllers/Admin/SingletonModuleController.php b/src/Http/Controllers/Admin/SingletonModuleController.php
index d00403ce5..b47dd451c 100644
--- a/src/Http/Controllers/Admin/SingletonModuleController.php
+++ b/src/Http/Controllers/Admin/SingletonModuleController.php
@@ -11,7 +11,7 @@ abstract class SingletonModuleController extends ModuleController
 {
     protected $permalinkBase = '';
 
-    public function index(?int $parentModuleId = null): mixed
+    public function index(int|string|null $parentModuleId = null): mixed
     {
         throw new \Exception("{$this->getModelName()} has no index");
     }
diff --git a/src/Http/Controllers/Admin/UserController.php b/src/Http/Controllers/Admin/UserController.php
index fb8cc58ec..1f2c0e273 100755
--- a/src/Http/Controllers/Admin/UserController.php
+++ b/src/Http/Controllers/Admin/UserController.php
@@ -296,7 +296,7 @@ public function edit(int|string|TwillModelContract $id): mixed
         return parent::edit($id);
     }
 
-    public function update(int|string|TwillModelContract $id, ?int $submoduleId = null): JsonResponse
+    public function update(int|string|TwillModelContract $id, int|string|null $submoduleId = null): JsonResponse
     {
         $this->authorizableOptions['edit'] = 'edit-user';