diff --git a/ghost/admin/lib/koenig-editor/addon/helpers/clean-basic-html.js b/ghost/admin/lib/koenig-editor/addon/helpers/clean-basic-html.js
index 8ce8961c13..b61d8cb59c 100644
--- a/ghost/admin/lib/koenig-editor/addon/helpers/clean-basic-html.js
+++ b/ghost/admin/lib/koenig-editor/addon/helpers/clean-basic-html.js
@@ -3,7 +3,7 @@ import {isArray} from '@ember/array';
 
 export function cleanBasicHtml(html = '') {
     if (isArray(html)) {
-        html = html[0];
+        html = html[0] || '';
     }
 
     let cleanHtml = html