Remove return type due to inconsistent data

html/typo3conf/ext/ter_fe2/Classes/Domain/Model/Relation.php

@@ -175,7 +175,7 @@ class Relation extends \TYPO3\CMS\Extbase\DomainObject\AbstractValueObject
      *
      * @return \T3o\TerFe2\Domain\Model\Extension
      */
-    public function getRelatedExtension(): Extension
+    public function getRelatedExtension()
     {
         return $this->relatedExtension;
     }