diff --git a/typo3/sysext/backend/Classes/Controller/FormInlineAjaxController.php b/typo3/sysext/backend/Classes/Controller/FormInlineAjaxController.php
index 9336141..c4bbd04 100644
--- a/typo3/sysext/backend/Classes/Controller/FormInlineAjaxController.php
+++ b/typo3/sysext/backend/Classes/Controller/FormInlineAjaxController.php
@@ -101,7 +101,12 @@ class FormInlineAjaxController
         }
 
         if ($parentConfig['type'] === 'flex') {
-            $parentConfig = $this->getParentConfigFromFlexForm($parentConfig, $domObjectId);
+            if(!empty($ajaxArguments['context'])) {
+                $ajaxContext = json_decode($ajaxArguments['context'], true);
+                $parentConfig = $ajaxContext['config'];
+            } else {
+                $parentConfig = $this->getParentConfigFromFlexForm($parentConfig, $domObjectId);
+            }
         }
         $childTableName = $parentConfig['foreign_table'];