diff --git a/dom.js b/dom.js
index f9a87e7..2e4bcfd 100644
--- a/dom.js
+++ b/dom.js
@@ -407,6 +407,8 @@ export const h = (e, props = {}, ...children) => {
 			};
 
 			const defer = () => {
+				if (!m) return;
+
 				assert(m === noop);
 				assert(currentErrorContext = errorContext);