diff --git a/docs/01-app/03-api-reference/03-file-conventions/error.mdx b/docs/01-app/03-api-reference/03-file-conventions/error.mdx
index fba5b9382caee..0a86e3ffe1eee 100644
--- a/docs/01-app/03-api-reference/03-file-conventions/error.mdx
+++ b/docs/01-app/03-api-reference/03-file-conventions/error.mdx
@@ -219,7 +219,7 @@ export class GracefullyDegradingErrorBoundary extends Component<
   ErrorBoundaryProps,
   ErrorBoundaryState
 > {
-  private contentRef: React.RefObject<HTMLDivElement>
+  private contentRef: React.RefObject<HTMLDivElement | null>
 
   constructor(props: ErrorBoundaryProps) {
     super(props)