Index: lams_central/web/ckeditor/plugins/image2/dialogs/image2.js
===================================================================
diff -u -r7475d08afc280b5e2e5ddf04e8bf35e3166aaf80 -r43cbdc5019e81e9a5f9d4c97be6be82233ade78a
--- lams_central/web/ckeditor/plugins/image2/dialogs/image2.js	(.../image2.js)	(revision 7475d08afc280b5e2e5ddf04e8bf35e3166aaf80)
+++ lams_central/web/ckeditor/plugins/image2/dialogs/image2.js	(.../image2.js)	(revision 43cbdc5019e81e9a5f9d4c97be6be82233ade78a)
@@ -39,7 +39,7 @@
         
     	//remove obsolete classes
         for (var oldClass in oldClasses) {
-            if (oldClasses.hasOwnProperty(oldClass) && !userEnteredClasses.includes(oldClass)) {
+            if (oldClasses.hasOwnProperty(oldClass) && userEnteredClasses.indexOf(oldClass) > -1) {
             	widget.removeClass(oldClass);
             }
         }