diff --git a/src/async.ts b/src/async.ts
index e5f67399..28efc17f 100644
--- a/src/async.ts
+++ b/src/async.ts
@@ -44,7 +44,7 @@ export const useAsync = <T>(
     !_ref.value ||
     (process.env.NODE_ENV === 'development' &&
       process.client &&
-      window[globalNuxt].context.isHMR)
+      window[globalNuxt]?.context.isHMR)
   ) {
     const p = cb()
 
diff --git a/src/ssr-ref.ts b/src/ssr-ref.ts
index 1b9dbe3a..4ca793cd 100644
--- a/src/ssr-ref.ts
+++ b/src/ssr-ref.ts
@@ -50,7 +50,7 @@ export const ssrRef = <T>(value: T | (() => T), key?: string): Ref<T> => {
   if (process.client) {
     if (
       process.env.NODE_ENV === 'development' &&
-      window[globalNuxt].context.isHMR
+      window[globalNuxt]?.context.isHMR
     ) {
       return ref(getValue(value))
     }
@@ -128,7 +128,7 @@ export const shallowSsrRef = <T>(
   if (process.client) {
     if (
       process.env.NODE_ENV === 'development' &&
-      window[globalNuxt].context.isHMR
+      window[globalNuxt]?.context.isHMR
     ) {
       return shallowRef(getValue(value))
     }