diff --git a/src/Form/EntityEmbedDialog.php b/src/Form/EntityEmbedDialog.php
index 160aa7a..32e70ec 100644
--- a/src/Form/EntityEmbedDialog.php
+++ b/src/Form/EntityEmbedDialog.php
@@ -819,7 +819,7 @@ class EntityEmbedDialog extends FormBase {
     }
     else {
       // Serialize entity embed settings to JSON string.
-      if (!empty($values['attributes']['data-entity-embed-display-settings'])) {
+      if (isset($values['attributes']['data-entity-embed-display-settings'])) {
         $values['attributes']['data-entity-embed-display-settings'] = Json::encode($values['attributes']['data-entity-embed-display-settings']);
       }