diff --git a/src/bundle/Resources/public/js/CKEditor/custom-tags/inline-custom-tag/inline-custom-tag-editing.js b/src/bundle/Resources/public/js/CKEditor/custom-tags/inline-custom-tag/inline-custom-tag-editing.js
index ff815715..f891517d 100644
--- a/src/bundle/Resources/public/js/CKEditor/custom-tags/inline-custom-tag/inline-custom-tag-editing.js
+++ b/src/bundle/Resources/public/js/CKEditor/custom-tags/inline-custom-tag/inline-custom-tag-editing.js
@@ -1,6 +1,7 @@
 import Plugin from '@ckeditor/ckeditor5-core/src/plugin';
 import Widget from '@ckeditor/ckeditor5-widget/src/widget';
 import { toWidget } from '@ckeditor/ckeditor5-widget/src/utils';
+import Element from '@ckeditor/ckeditor5-engine/src/view/element';
 
 import IbexaInlineCustomTagCommand from './inline-custom-tag-command';
 
@@ -92,6 +93,10 @@ class IbexaInlineCustomTagEditing extends Plugin {
                 const values = {};
 
                 for (const configValue of configValuesIterator) {
+                    if (configValue instanceof Element === false) {
+                        continue;
+                    }
+
                     const value = configValue.getChild(0)?.data ?? null;
 
                     values[configValue.getAttribute('data-ezvalue-key')] = value;