diff --git a/composer.json b/composer.json
index c814b7c..942d6c0 100644
--- a/composer.json
+++ b/composer.json
@@ -1,7 +1,7 @@
 {
     "name": "ergonode/integration-shopware",
     "description": "Shopware Ergonode Integration",
-    "version": "3.0.0",
+    "version": "3.0.1",
     "type": "shopware-platform-plugin",
     "license": "proprietary",
     "authors": [
diff --git a/src/Processor/Attribute/ManufacturerAttributeProcessor.php b/src/Processor/Attribute/ManufacturerAttributeProcessor.php
index b7d5c62..0edb59f 100644
--- a/src/Processor/Attribute/ManufacturerAttributeProcessor.php
+++ b/src/Processor/Attribute/ManufacturerAttributeProcessor.php
@@ -101,7 +101,7 @@ private function removeLegacyManufacturers(array $processedIds, Context $context
         );
         $criteria->addFilter(new EqualsFilter('type', self::MAPPING_TYPE));
         $existingIds = $this->mappingExtensionRepository->searchIds($criteria, $context);
-        $existingIds = array_map(fn($id) => ['id' => $id], $existingIds);
+        $existingIds = array_map(fn($id) => ['id' => $id], $existingIds->getIds());
         if (empty($existingIds)) {
             return;
         }