diff --git a/src/stores/message.js b/src/stores/message.js
index ef54e3f..aa59e2e 100644
--- a/src/stores/message.js
+++ b/src/stores/message.js
@@ -133,10 +133,10 @@ export const messageStore = defineStore('anyim-message', () => {
         msgRecordsList.value[sessionId] = {}
       }
 
-      // seq为undefined或者seq没有被缓存，才能add这条消息
-      if (item.seq === undefined || !(item.seq in msgUniqueSeq.value)) {
+      // seq没有或者seq没有被缓存，才能add这条消息
+      if (!item.seq || !(item.seq in msgUniqueSeq.value)) {
         msgRecordsList.value[sessionId][item.msgId] = item
-        if (item.seq !== undefined) {
+        if (item.seq) {
           // seq不为空则添加至缓存
           msgUniqueSeq.value[item.seq] = item.msgId
         }
@@ -155,7 +155,7 @@ export const messageStore = defineStore('anyim-message', () => {
    */
   const removeMsgRecord = (sessionId, msgId) => {
     const msg = msgRecordsList.value[sessionId][msgId]
-    if (msg === undefined) return
+    if (!msg) return
     if (msg.seq in msgUniqueSeq.value) delete msgUniqueSeq.value[msg.seq]
     if (msgId in msgRecordsList.value[sessionId]) delete msgRecordsList.value[sessionId][msgId]
   }
diff --git a/src/views/message/MessageLayout.vue b/src/views/message/MessageLayout.vue
index 4c375da..b9165fc 100644
--- a/src/views/message/MessageLayout.vue
+++ b/src/views/message/MessageLayout.vue
@@ -98,7 +98,7 @@ const msgIdSortArray = computed(() => {
 
 // 缓存的消息列表是否为空，注意和hasNoMoreMsg的区别，前者为空可以再拉取
 const noMsgRecords = computed(() => {
-  return msgIdSortArray.value.length === 0
+  return msgIdSortArray.value?.length === 0
 })
 // 当前session的第一条消息ID
 const firstMsgId = computed(() => {
@@ -111,8 +111,8 @@ const firstMsgId = computed(() => {
 // 当前session的最后一条消息ID
 const lastMsgId = computed(() => {
   if (!noMsgRecords.value) {
-    const len = msgIdSortArray.value.length
-    return msgIdSortArray.value[len - 1]
+    const len = msgIdSortArray.value?.length
+    return len ? msgIdSortArray.value[len - 1] : 0
   } else {
     return 0
   }