diff --git a/application/WarehouseShippingNote/WarehouseShippingNoteModel.php b/application/WarehouseShippingNote/WarehouseShippingNoteModel.php
index 73526c0d0..bf4851248 100644
--- a/application/WarehouseShippingNote/WarehouseShippingNoteModel.php
+++ b/application/WarehouseShippingNote/WarehouseShippingNoteModel.php
@@ -3,7 +3,7 @@
 class WarehouseShippingNoteModel extends TTCrudBaseModel {
     public int $id;
     public ?int $billingAddressId;
-    public string $type;
+    public ?string $type;
     public string $deliveryAddressName;
     public string $deliveryAddressLine;
     public string $deliveryAddressPLZ;
diff --git a/db/migrations/20250408150000_warehouse_modify_18.php b/db/migrations/20250408150000_warehouse_modify_18.php
new file mode 100644
index 000000000..458818ff9
--- /dev/null
+++ b/db/migrations/20250408150000_warehouse_modify_18.php
@@ -0,0 +1,25 @@
+<?php declare(strict_types = 1);
+
+use Phinx\Migration\AbstractMigration;
+
+final class WarehouseModify18 extends AbstractMigration {
+    public function up(): void {
+        if ($this->getEnvironment() == "thetool") {
+            $WarehouseShippingNoteTable = $this->table("WarehouseShippingNote");
+            $WarehouseShippingNoteTable
+                ->changeColumn("type", "string", ["limit" => 255, "default" => null])
+                ->save();
+        }
+    }
+
+    public function down(): void {
+        if ($this->getEnvironment() == "thetool") {
+            $WarehouseShippingNoteTable = $this->table("WarehouseShippingNote");
+            if ($WarehouseShippingNoteTable->hasColumn("type")) {
+                $WarehouseShippingNoteTable
+                    ->changeColumn("type", "string", ["limit" => 255])
+                    ->save();
+            }
+        }
+    }
+}