diff --git a/src/views/NewEmail.jsx b/src/views/NewEmail.jsx
index 939cacd..85590c6 100644
--- a/src/views/NewEmail.jsx
+++ b/src/views/NewEmail.jsx
@@ -576,10 +576,12 @@ const NewEmail = () => {
   const idleCallbackId = useRef(null)
   const debouncedSave = useCallback(
     debounce((data) => {
-      idleCallbackId.current = window.requestIdleCallback(() => {
-        console.log('Saving data (idle, debounced):', data)
-        writeIndexDB([{ ...data, key: editorKey }], 'draft', 'mailbox')
-      })
+      if ('requestIdleCallback' in window) {
+        idleCallbackId.current = window.requestIdleCallback(() => {
+          console.log('Saving data (idle, debounced):', data)
+          writeIndexDB([{ ...data, key: editorKey }], 'draft', 'mailbox')
+        })
+      }
     }, 1500), //  1.5s
     [],
   )