diff --git a/build/media_source/plg_editors_tinymce/js/tinymce.es6.js b/build/media_source/plg_editors_tinymce/js/tinymce.es6.js
index 795dc92d7f13b..aad5d4592ef9b 100644
--- a/build/media_source/plg_editors_tinymce/js/tinymce.es6.js
+++ b/build/media_source/plg_editors_tinymce/js/tinymce.es6.js
@@ -33,12 +33,14 @@
           toggleButton.removeAttribute('disabled');
           toggleButton.addEventListener('click', () => {
             if (Joomla.editors.instances[currentEditor.id].instance.isHidden()) {
-              toggleIcon.setAttribute('class', 'icon-eye');
               Joomla.editors.instances[currentEditor.id].instance.show();
             } else {
-              toggleIcon.setAttribute('class', 'icon-eye-slash');
               Joomla.editors.instances[currentEditor.id].instance.hide();
             }
+
+            if (toggleIcon) {
+              toggleIcon.setAttribute('class', Joomla.editors.instances[currentEditor.id].instance.isHidden() ? 'icon-eye' : 'icon-eye-slash');
+            }
           });
         }
       });