docs: update content

2021-10-26 18:43:58 +02:00
parent 642627ec36
commit e28b770f60
1 changed files with 1 additions and 1 deletions
--- a/docs/guide/custom-extensions.md
+++ b/docs/guide/custom-extensions.md
@@ -73,7 +73,7 @@ import Heading from '@tiptap/extension-heading'
 const CustomHeading = Heading.extend({
  addOptions() {
    return {
-      ...this.parent(),
+      ...this.parent?.(),
      levels: [1, 2, 3],
    }
  },