diff --git a/src/Command/User/UsersPermissionsCommand.php b/src/Command/User/UsersPermissionsCommand.php
index 0d07a821..5bb3f11c 100644
--- a/src/Command/User/UsersPermissionsCommand.php
+++ b/src/Command/User/UsersPermissionsCommand.php
@@ -108,8 +108,12 @@ class UsersPermissionsCommand extends Command
                 $this->entityManager->flush();
 
                 break; //Show the new table
-            } else {
+            }
+
+            if (isset($op_to_edit, $perm_to_edit)) {
                 $this->permissionResolver->setPermission($user, $perm_to_edit, $op_to_edit, $new_value);
+            } else {
+                throw new \RuntimeException('Erorr while editing permission');
             }
 
             //Ensure that all operations are set accordingly
diff --git a/src/Controller/TreeController.php b/src/Controller/TreeController.php
index a3a1c6aa..500c5c00 100644
--- a/src/Controller/TreeController.php
+++ b/src/Controller/TreeController.php
@@ -145,6 +145,8 @@ class TreeController extends AbstractController
     {
         if ($this->isGranted('@parts.read') && $this->isGranted('@suppliers.read')) {
             $tree = $this->treeGenerator->getTreeView(Supplier::class, $supplier, 'list_parts_root');
+        } else {
+            return new JsonResponse("Access denied", 403);
         }
 
         return new JsonResponse($tree);
diff --git a/src/Security/Voter/AttachmentVoter.php b/src/Security/Voter/AttachmentVoter.php
index 2364cef1..e0ec23c1 100644
--- a/src/Security/Voter/AttachmentVoter.php
+++ b/src/Security/Voter/AttachmentVoter.php
@@ -91,6 +91,8 @@ class AttachmentVoter extends ExtendedVoter
             case 'show_private':
                 return $this->resolver->inherit($user, 'attachments', 'show_private') ?? false;
         }
+
+        throw new \RuntimeException('Encountered unknown attribute "'.$attribute.'" in AttachmentVoter!');
     }
 
     /**
diff --git a/src/Security/Voter/ParameterVoter.php b/src/Security/Voter/ParameterVoter.php
index 09ffeaf6..8569b680 100644
--- a/src/Security/Voter/ParameterVoter.php
+++ b/src/Security/Voter/ParameterVoter.php
@@ -17,7 +17,7 @@ use App\Entity\Parameters\SupplierParameter;
 use App\Entity\UserSystem\User;
 use App\Services\UserSystem\PermissionManager;
 use Doctrine\ORM\EntityManagerInterface;
-use PHPUnit\TextUI\RuntimeException;
+use RuntimeException;
 use Symfony\Component\Security\Core\Security;
 
 class ParameterVoter extends ExtendedVoter
diff --git a/src/Services/UserSystem/PermissionPresetsHelper.php b/src/Services/UserSystem/PermissionPresetsHelper.php
index 6dcbe8a2..5b07eeae 100644
--- a/src/Services/UserSystem/PermissionPresetsHelper.php
+++ b/src/Services/UserSystem/PermissionPresetsHelper.php
@@ -25,9 +25,8 @@ class PermissionPresetsHelper
      * Apply the given preset to the permission holding entity (like a user)
      * The permission data will be reset during the process and then the preset will be applied.
      *
-     * @param
      * @param  string  $preset_name The name of the preset to use
-     * @return PermissionData
+     * @return HasPermissionsInterface
      */
     public function applyPreset(HasPermissionsInterface $perm_holder, string $preset_name): HasPermissionsInterface
     {