diff --git a/src/Entity/Attachments/AttachmentContainingDBElement.php b/src/Entity/Attachments/AttachmentContainingDBElement.php
index 8160e9c7..d3434161 100644
--- a/src/Entity/Attachments/AttachmentContainingDBElement.php
+++ b/src/Entity/Attachments/AttachmentContainingDBElement.php
@@ -53,8 +53,10 @@ declare(strict_types=1);
 namespace App\Entity\Attachments;
 
 use App\Entity\Base\NamedDBElement;
+use Doctrine\Common\Collections\ArrayCollection;
 use Doctrine\Common\Collections\Collection;
 use Doctrine\ORM\Mapping as ORM;
+use Doctrine\ORM\PersistentCollection;
 use Exception;
 
 /**
@@ -74,6 +76,11 @@ abstract class AttachmentContainingDBElement extends NamedDBElement
     //TODO
     protected $attachmentTypes;
 
+    public function __construct()
+    {
+        $this->attachments = new ArrayCollection();
+    }
+
     /********************************************************************************
      *
      *   Getters
diff --git a/src/Entity/Parts/Part.php b/src/Entity/Parts/Part.php
index df4b794c..5fc607a6 100644
--- a/src/Entity/Parts/Part.php
+++ b/src/Entity/Parts/Part.php
@@ -67,6 +67,8 @@ use App\Entity\Devices\Device;
 use App\Entity\PriceInformations\Orderdetail;
 use App\Security\Annotations\ColumnSecurity;
 use App\Validator\Constraints\Selectable;
+use Doctrine\Common\Collections\ArrayCollection;
+use Doctrine\Common\Collections\Collection;
 use Doctrine\ORM\Mapping as ORM;
 
 use Doctrine\ORM\PersistentCollection;
@@ -167,7 +169,7 @@ class Part extends AttachmentContainingDBElement
      *
      * @ColumnSecurity(prefix="name")
      */
-    protected $name;
+    protected $name = '';
 
     /**
      * @var string
@@ -239,7 +241,7 @@ class Part extends AttachmentContainingDBElement
      * @ORM\Column(type="string")
      * @ColumnSecurity(prefix="manufacturer", type="string", placeholder="")
      */
-    protected $manufacturer_product_number;
+    protected $manufacturer_product_number = '';
 
     /**
      * @var bool Determines if this part entry needs review (for example, because it is work in progress)
@@ -258,7 +260,7 @@ class Part extends AttachmentContainingDBElement
      * @var string A comma seperated list of tags, assocciated with the part.
      * @ORM\Column(type="text")
      */
-    protected $tags;
+    protected $tags = '';
 
     /**
      * @var float|null How much a single part unit weighs in gramms.
@@ -267,6 +269,12 @@ class Part extends AttachmentContainingDBElement
      */
     protected $mass;
 
+    public function __construct()
+    {
+        parent::__construct();
+        $this->partLots = new ArrayCollection();
+    }
+
     /**
      * Returns the ID as an string, defined by the element class.
      * This should have a form like P000014, for a part with ID 14.
@@ -473,7 +481,7 @@ class Part extends AttachmentContainingDBElement
      *                        * the array is sorted by the suppliers names / minimum order quantity
      *
      */
-    public function getOrderdetails(bool $hide_obsolete = false) : PersistentCollection
+    public function getOrderdetails(bool $hide_obsolete = false) : Collection
     {
         //If needed hide the obsolete entries
         if ($hide_obsolete) {
@@ -587,9 +595,9 @@ class Part extends AttachmentContainingDBElement
 
     /**
      * Get all part lots where this part is stored.
-     * @return PartLot[]|PersistentCollection
+     * @return PartLot[]|Collection
      */
-    public function getPartLots() : PersistentCollection
+    public function getPartLots() : Collection
     {
         return $this->partLots;
     }
diff --git a/src/Form/Part/PartBaseType.php b/src/Form/Part/PartBaseType.php
index ad8fe5bf..5730ae04 100644
--- a/src/Form/Part/PartBaseType.php
+++ b/src/Form/Part/PartBaseType.php
@@ -93,10 +93,10 @@ class PartBaseType extends AbstractType
             ->add('category', StructuralEntityType::class, ['class' => Category::class,
                 'label' => 'category.label', 'disable_not_selectable' => true,
                 'disabled' => !$this->security->isGranted('move', $part), ])
-            ->add('footprint', StructuralEntityType::class, ['class' => Footprint::class,
+            ->add('footprint', StructuralEntityType::class, ['class' => Footprint::class, 'required' => false,
                 'label' => 'footprint.label', 'disable_not_selectable' => true,
                 'disabled' => !$this->security->isGranted('move', $part), ])
-            ->add('tags', TextType::class, ['required' => false, 'label' => 'part.tags',
+            ->add('tags', TextType::class, ['required' => false, 'label' => 'part.tags', 'empty_data' => "",
                 'attr' => ['data-role' => 'tagsinput'],
                 'disabled' => !$this->security->isGranted('edit', $part) ])
             ->add('comment', CKEditorType::class, ['required' => false,