diff --git a/packages/runtime-dom/src/index.ts b/packages/runtime-dom/src/index.ts
index f6f0cf322c4..ed35e1293f8 100644
--- a/packages/runtime-dom/src/index.ts
+++ b/packages/runtime-dom/src/index.ts
@@ -184,6 +184,7 @@ function normalizeContainer(
   }
   if (
     __DEV__ &&
+    window.ShadowRoot &&
     container instanceof window.ShadowRoot &&
     container.mode === 'closed'
   ) {