diff --git a/resources/js/ext.uls.launch.js b/resources/js/ext.uls.launch.js
index ce95e14d..e2bfe9de 100644
--- a/resources/js/ext.uls.launch.js
+++ b/resources/js/ext.uls.launch.js
@@ -3,7 +3,7 @@
  */
 
 /* eslint-disable no-implicit-globals */
-var commonInterlanguageList;
+var commonInterlanguageList = null;
 
 /**
  * @param {string[]} languageCodes array of language codes available