diff --git a/js/main.js b/js/main.js
index 6cd76a2..f40dcfd 100644
--- a/js/main.js
+++ b/js/main.js
@@ -84,6 +84,7 @@ function checkPersist() {
 	g_persist.forEach((v) => {
 		v.put('foo');
 	});
+	scanPromises();
 }
 
 
diff --git a/js/promise.js b/js/promise.js
index 97e70b8..436a820 100644
--- a/js/promise.js
+++ b/js/promise.js
@@ -5,7 +5,7 @@ async function putPromise(o) {
 	h.update(v);
 	const z = h.getHash("HEX");
 	g_persistIndex.push(z);
-	localStorage.setItem('persist', JSON.stringify(g_persistIndex));
+	localStorage.setItem(PERSIST_STORAGEKEY, JSON.stringify(g_persistIndex));
 	for (let i = 0; i < g_persist.length; i++) {
 		const o = g_persist[i];
 		const r = await o.put(v);
@@ -15,7 +15,10 @@ async function putPromise(o) {
 }
 
 async function scanPromises() {
-	const promises = localStorage.getItem('persist');
+	const promises = localStorage.getItem(PERSIST_STORAGEKEY);
+	if (!promises) {
+		return;
+	}
 	const o = JSON.parse(promises);
 	const eList = document.createElement('ul');
 	eList.setAttribute('id', 'promiseList');