diff --git a/app/src/Repository/ModRepository.php b/app/src/Repository/ModRepository.php
index a854c4e..e2dcf3d 100644
--- a/app/src/Repository/ModRepository.php
+++ b/app/src/Repository/ModRepository.php
@@ -5,7 +5,6 @@ namespace App\Repository;
 use App\Entity\Mod;
 use Doctrine\Bundle\DoctrineBundle\Repository\ServiceEntityRepository;
 use Doctrine\Persistence\ManagerRegistry;
-use function PHPUnit\Framework\isNull;
 
 /**
  * @extends ServiceEntityRepository<Mod>
@@ -24,7 +23,7 @@ class ModRepository extends ServiceEntityRepository
     public function findAvailableDependances(?Mod $mod): array
     {
         $excludedIds = [];
-        if (!isnull($mod)) {
+        if ($mod !== null) {
             $excludedIds = $this->collectDependencyIds($mod, []);
             $excludedIds[] = $mod->getId();
         }