diff --git a/src/public/app/widgets/attribute_widgets/attribute_editor.js b/src/public/app/widgets/attribute_widgets/attribute_editor.js
index e04627586..18a1ccfa5 100644
--- a/src/public/app/widgets/attribute_widgets/attribute_editor.js
+++ b/src/public/app/widgets/attribute_widgets/attribute_editor.js
@@ -338,6 +338,11 @@ export default class AttributeEditorWidget extends TabAwareWidget {
 
         this.textEditor = await BalloonEditor.create(this.$editor[0], editorConfig);
         this.textEditor.model.document.on('change:data', () => this.dataChanged());
+        this.textEditor.editing.view.document.on('enter', (event, data) => {
+            // disable entering new line - see https://github.com/ckeditor/ckeditor5/issues/9422
+            data.preventDefault();
+            event.stop();
+        }, {priority: 'high'});
 
         // disable spellcheck for attribute editor
         this.textEditor.editing.view.change(writer => writer.setAttribute('spellcheck', 'false', this.textEditor.editing.view.document.getRoot()));