diff --git a/src/Plugin/migrate/process/ChildEntityGenerate.php b/src/Plugin/migrate/process/ChildEntityGenerate.php
index 84ca43f..aed437f 100644
--- a/src/Plugin/migrate/process/ChildEntityGenerate.php
+++ b/src/Plugin/migrate/process/ChildEntityGenerate.php
@@ -147,11 +147,11 @@ class ChildEntityGenerate extends ProcessPluginBase implements ContainerFactoryP
     }
 
     foreach ($this->configuration['values'] ?? [] as $fieldName => $key) {
-      if (is_array($value)) {
-        $fieldValue = $value[$key] ?? NULL;
+      if (is_array($value) && array_key_exists($key, $value)) {
+        $fieldValue = $value[$key];
       }
-      elseif (is_object($value)) {
-        $fieldValue = property_exists($value, $key) ? $value->$key : NULL;
+      elseif (is_object($value) && property_exists($value, $key)) {
+        $fieldValue = $value->$key;
       }
       else {
         $fieldValue = $row->get($key);