diff --git a/lib/utils/helpers.js b/lib/utils/helpers.js
index d4a64466c98d807e75c93604abca053d244a5428..22582a933ee009ee270bff26d68394a96a669247 100644
--- a/lib/utils/helpers.js
+++ b/lib/utils/helpers.js
@@ -1,6 +1,6 @@
 'use strict';
 
-function escapeMdx(value) {
+function escapeMdx(value = '') {
   // New values are unicode!
   return value.replace('<', '＜').replace('>', '＞');
 }