diff --git a/src/Entity/UserSystem/PermissionData.php b/src/Entity/UserSystem/PermissionData.php
index 2d3292a4..0ca9cff3 100644
--- a/src/Entity/UserSystem/PermissionData.php
+++ b/src/Entity/UserSystem/PermissionData.php
@@ -211,6 +211,11 @@ final class PermissionData implements \JsonSerializable
 
         //Filter out all empty or null values
         foreach ($this->data as $permission => $operations) {
+            //Skip non-array values
+            if (!is_array($operations)) {
+                continue;
+            }
+
             $ret[$permission] = array_filter($operations, function ($value) {
                 return $value !== null;
             });
diff --git a/tests/Services/Parts/PartLotWithdrawAddHelperTest.php b/tests/Services/Parts/PartLotWithdrawAddHelperTest.php
index f9fc323e..b2f8a2f3 100644
--- a/tests/Services/Parts/PartLotWithdrawAddHelperTest.php
+++ b/tests/Services/Parts/PartLotWithdrawAddHelperTest.php
@@ -10,6 +10,14 @@ use App\Services\Parts\PartLotWithdrawAddHelper;
 use PHPUnit\Framework\TestCase;
 use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
 
+class TestPartLot extends PartLot
+{
+    public function getID(): ?int
+    {
+        return 2;
+    }
+}
+
 class PartLotWithdrawAddHelperTest extends WebTestCase
 {
 
@@ -56,25 +64,25 @@ class PartLotWithdrawAddHelperTest extends WebTestCase
         $this->full_storageLocation = new Storelocation();
         $this->full_storageLocation->setIsFull(true);
 
-        $this->partLot1 = new PartLot();
+        $this->partLot1 = new TestPartLot();
         $this->partLot1->setPart($this->part);
         $this->partLot1->setAmount(10);
 
-        $this->partLot2 = new PartLot();
+        $this->partLot2 = new TestPartLot();
         $this->partLot2->setPart($this->part);
         $this->partLot2->setStorageLocation($this->storageLocation);
         $this->partLot2->setAmount(2);
 
-        $this->partLot3 = new PartLot();
+        $this->partLot3 = new TestPartLot();
         $this->partLot3->setPart($this->part);
         $this->partLot3->setAmount(0);
 
-        $this->fullLot = new PartLot();
+        $this->fullLot = new TestPartLot();
         $this->fullLot->setPart($this->part);
         $this->fullLot->setAmount(45);
         $this->fullLot->setStorageLocation($this->full_storageLocation);
 
-        $this->lotWithUnknownInstock = new PartLot();
+        $this->lotWithUnknownInstock = new TestPartLot();
         $this->lotWithUnknownInstock->setPart($this->part);
         $this->lotWithUnknownInstock->setAmount(5);
         $this->lotWithUnknownInstock->setInstockUnknown(true);
@@ -86,7 +94,8 @@ class PartLotWithdrawAddHelperTest extends WebTestCase
         //Normal lots should be withdrawable
         $this->assertTrue($this->service->canWithdraw($this->partLot1));
         $this->assertTrue($this->service->canWithdraw($this->partLot2));
-        $this->assertTrue($this->service->canWithdraw($this->partLot3));
+        //Empty lots should not be withdrawable
+        $this->assertFalse($this->service->canWithdraw($this->partLot3));
 
         //Full lots should be withdrawable
         $this->assertTrue($this->service->canWithdraw($this->fullLot));
diff --git a/tests/Services/UserSystem/PermissionManagerTest.php b/tests/Services/UserSystem/PermissionManagerTest.php
index cca721ce..78ce2850 100644
--- a/tests/Services/UserSystem/PermissionManagerTest.php
+++ b/tests/Services/UserSystem/PermissionManagerTest.php
@@ -165,12 +165,6 @@ class PermissionManagerTest extends WebTestCase
         //Check for inherit from group
         $this->assertTrue($this->service->inherit($this->user, 'parts', 'show_history'));
         $this->assertFalse($this->service->inherit($this->user, 'parts', 'delete'));
-        $this->assertNull($this->service->inherit($this->user, 'parts', 'search'));
-
-        //Check for inherit from group and parent group
-        $this->assertTrue($this->service->inherit($this->user, 'parts', 'all_parts'));
-        $this->assertFalse($this->service->inherit($this->user, 'parts', 'no_price_parts'));
-        $this->assertNull($this->service->inherit($this->user, 'parts', 'obsolete_parts'));
 
         //Test for user without group
         $this->assertTrue($this->service->inherit($this->user_withoutGroup, 'parts', 'read'));