diff --git a/packages/svelte/tests/runtime-runes/samples/custom-element-attributes/_config.js b/packages/svelte/tests/runtime-runes/samples/custom-element-attributes/_config.js
index 984a790ed4..3d8917c147 100644
--- a/packages/svelte/tests/runtime-runes/samples/custom-element-attributes/_config.js
+++ b/packages/svelte/tests/runtime-runes/samples/custom-element-attributes/_config.js
@@ -22,6 +22,6 @@ export default test({
 		assert.equal(value2.shadowRoot?.innerHTML, '<span>test</span>');
 
 		const value_builtin = target.querySelector('div');
-		assert.equal(value_builtin.shadowRoot?.innerHTML, '<span>test</span>');
+		assert.equal(value_builtin?.shadowRoot?.innerHTML, '<span>test</span>');
 	}
 });