diff --git a/admin/themes/default/js/common.js b/admin/themes/default/js/common.js
index 11504da8b..7bc15e734 100644
--- a/admin/themes/default/js/common.js
+++ b/admin/themes/default/js/common.js
@@ -142,10 +142,12 @@ $('.search-input').on('input', function() {
 
 // Class to implement a temporary state and reverse it
 class TemporaryState {
-  //Arrays to reverse changes
-  attrChanges = []; //Attribute changes : {object(s), attribute, value}
-  classChanges = []; //Class changes : {object(s), state(add:true/remove:false), class}
-  htmlChanges = []; //Html changes : {object(s), html}
+  constructor() {
+    //Arrays to reverse changes
+    this.attrChanges = []; //Attribute changes : {object(s), attribute, value}
+    this.classChanges = []; //Class changes : {object(s), state(add:true/remove:false), class}
+    this.htmlChanges = []; //Html changes : {object(s), html}
+  }
 
   /**
    * Change temporaly an attribute of an object