diff --git a/src/ConfigElement/Value/DimensionUnitField.php b/src/ConfigElement/Value/DimensionUnitField.php
index fbf58ef..245e50c 100644
--- a/src/ConfigElement/Value/DimensionUnitField.php
+++ b/src/ConfigElement/Value/DimensionUnitField.php
@@ -41,6 +41,7 @@ public function getLabeledValue($object)
             $result = new \stdClass();
             $result->label = $rawResult->label;
             $result->def = $rawResult->def ?? null;
+            $result->value = null;
 
             $formatter = \Pimcore::getContainer()->get(\Pimcore\Localization\IntlFormatter::class);