Issue #3402009 by Snater: Can't Insert images into textareas after Drupal 10 upgrade

js/FocusManager.js

@@ -183,6 +183,10 @@
           return currentEditorInstance;
         }
 
+        if (this._$textareas.length) {
+          return this._$textareas.get(0);
+        }
+
         return null;
       }
 

js/editors/CKEditor.js

@@ -62,7 +62,7 @@
        * @inheritDoc
        */
       getCurrentInstance: function() {
-        return CKEDITOR.currentInstance;
+        return CKEDITOR?.currentInstance;
       },
 
       /**