diff --git a/app/DataBase/output_pc.py b/app/DataBase/output_pc.py
index 3a9d967..d322546 100644
--- a/app/DataBase/output_pc.py
+++ b/app/DataBase/output_pc.py
@@ -336,11 +336,7 @@ class ChildThread(QThread):
         displayname = escape_js_and_html(displayname)
         if self.output_type == Output.HTML:
             emoji_path = get_emoji(str_content, thumb=True, output_path=origin_docx_path + '/emoji')
-            if emoji_path == "":
-                # todo 改为网络404图片
-                emoji_path = "./emoji/404.png"
-            else:
-                emoji_path = './emoji/' + os.path.basename(emoji_path)
+            emoji_path = './emoji/' + os.path.basename(emoji_path)
             if self.is_5_min(timestamp):
                 doc.write(
                     f'''{{ type:0, text: '{str_time}',is_send:0,avatar_path:'',timestamp:{timestamp},is_chatroom:{is_chatroom},displayname:'{displayname}'}},'''
@@ -549,6 +545,7 @@ class ChildThread(QThread):
                     if not os.path.exists(chatroom_avatar_path):
                         message[12].avatar.save(chatroom_avatar_path)
                 except:
+                    print(message)
                     pass
         else:
             self.contact.avatar.save(os.path.join(f"{origin_docx_path}/avatar/{self.contact.wxid}.png"))
@@ -1080,11 +1077,16 @@ html_end = '''
 
     const itemsPerPage = 100; // 每页显示的元素个数
     let currentPage = 1; // 当前页
-var reachedBottom = false; // 到达底部的标记
+    var reachedBottom = false; // 到达底部的标记
+    var lastScrollTop = 0;
     function renderPage(page) {
-         reachedBottom = false;
         const container = document.getElementById('chat-container');
-        container.innerHTML = ''; // 清空容器
+        if (!reachedBottom) {
+            container.innerHTML = ''; // 清空容器
+            lastScrollTop = 0;
+        } else {
+            reachedBottom = false;
+        }
 
         // 计算当前页应该显示的元素范围
         const startIndex = (page - 1) * itemsPerPage;
@@ -1141,7 +1143,7 @@ var reachedBottom = false; // 到达底部的标记
             return messageAudioTag;
         }
         
-            // 从数据列表中取出对应范围的元素并添加到容器中
+        // 从数据列表中取出对应范围的元素并添加到容器中
         for (let i = startIndex; i < endIndex && i < chatMessages.length; i++) {
             const message = chatMessages[i];
             if (i == startIndex) { // 判断一下在页面顶部多加一个时间
@@ -1249,7 +1251,7 @@ var reachedBottom = false; // 到达底部的标记
             }
             chatContainer.appendChild(messageElement);
         }
-        document.querySelector("#chat-container").scrollTop = 0;
+        document.querySelector("#chat-container").scrollTop = lastScrollTop;
         updatePaginationInfo();
         refreshMediaListener();
     }
@@ -1287,22 +1289,22 @@ var reachedBottom = false; // 到达底部的标记
     }
 
 
-  function checkScroll() {
-    var chatContainer = document.getElementById("chat-container");
+    function checkScroll() {
+        var chatContainer = document.getElementById("chat-container");
 
-    // 检查滚动条是否滑到底部
-    if (chatContainer.scrollHeight - chatContainer.scrollTop === chatContainer.clientHeight) {
-      // 如果滚动条在底部
-      if (!reachedBottom) {
-        // 设置标记并返回
-        reachedBottom = true;
-        return;
-      }
-      else{
-        nextPage();
-      }
+        // 检查滚动条是否滑到底部
+        if (chatContainer.scrollHeight - chatContainer.scrollTop - 10 <= chatContainer.clientHeight) {
+            // 如果滚动条在底部
+            if (!reachedBottom) {
+                // 设置标记并返回
+                reachedBottom = true;
+                lastScrollTop = chatContainer.scrollTop;
+            }
+            if (reachedBottom) {
+                nextPage();
+            }
+        }
     }
-  }
     // 初始化页面
     renderPage(currentPage);
 
diff --git a/app/DataBase/package_msg.py b/app/DataBase/package_msg.py
index 1560063..138bb7d 100644
--- a/app/DataBase/package_msg.py
+++ b/app/DataBase/package_msg.py
@@ -3,7 +3,7 @@ import threading
 from app.DataBase import msg_db, micro_msg_db, misc_db
 from app.util.protocbuf.msg_pb2 import MessageBytesExtra
 from app.util.protocbuf.roomdata_pb2 import ChatRoomData
-from app.person import ContactPC, MePC
+from app.person import ContactPC, MePC, ContactDefault
 
 lock = threading.Lock()
 
@@ -107,12 +107,11 @@ class PackageMsg:
             a[9]: msgSvrId,
             a[10]: BytesExtra,
             a[11]: CompressContent,
-            a[12]: msg_sender, （ContactPC类型，这个才是群聊里的信息发送人，不是群聊或者自己是发送者没有这个字段）
+            a[12]: msg_sender, （ContactPC 或 ContactDefault 类型，这个才是群聊里的信息发送人，不是群聊或者自己是发送者没有这个字段）
         '''
         updated_messages = []  # 用于存储修改后的消息列表
 
         messages = msg_db.get_messages(chatroom_wxid)
-        
         for row in messages:
             message = list(row)
             if message[4] == 1: # 自己发送的就没必要解析了
@@ -120,6 +119,7 @@ class PackageMsg:
                 updated_messages.append(message)
                 continue
             if message[10] is None: # BytesExtra是空的跳过
+                message.append(ContactDefault(wxid))
                 updated_messages.append(message)
                 continue
             msgbytes = MessageBytesExtra()
@@ -130,9 +130,14 @@ class PackageMsg:
                     continue
                 wxid = tmp.field2
             if wxid == "": # 系统消息里面 wxid 不存在
+                message.append(ContactDefault(wxid))
                 updated_messages.append(message)
                 continue
             contact_info_list = micro_msg_db.get_contact_by_username(wxid)
+            if contact_info_list is None: # 群聊中已退群的联系人不会保存在数据库里
+                message.append(ContactDefault(wxid))
+                updated_messages.append(message)
+                continue
             contact_info = {
                 'UserName': contact_info_list[0],
                 'Alias': contact_info_list[1],
@@ -145,7 +150,7 @@ class PackageMsg:
             contact.smallHeadImgBLOG = misc_db.get_avatar_buffer(contact.wxid)
             contact.set_avatar(contact.smallHeadImgBLOG)
             message.append(contact)
-            updated_messages.append(tuple(message))
+            updated_messages.append(message)
         return updated_messages
 
     def get_chatroom_member_list(self, strtalker):
@@ -175,4 +180,4 @@ class PackageMsg:
 
 if __name__ == "__main__":
     p = PackageMsg()
-    print(p.get_package_message_by_wxid("44326600419@chatroom"))
+    print(p.get_package_message_by_wxid("48615079469@chatroom"))
diff --git a/app/person.py b/app/person.py
index e1a49d2..dcd64a5 100644
--- a/app/person.py
+++ b/app/person.py
@@ -89,6 +89,40 @@ class ContactPC:
         self.avatar.save(save_path)
         print('保存头像', save_path)
 
+class ContactDefault:
+    def __init__(self, wxid=""):
+        self.avatar = QPixmap(Icon.Default_avatar_path)
+        self.avatar_path = ':/icons/icons/default_avatar.svg'
+        self.wxid = wxid
+        self.remark = wxid
+        self.alias = wxid
+        self.nickName = wxid
+        self.smallHeadImgUrl = ""
+        self.smallHeadImgBLOG = b''
+        self.is_chatroom = False
+    
+    def set_avatar(self, img_bytes):
+        if not img_bytes:
+            self.avatar.load(Icon.Default_avatar_path)
+            return
+        if img_bytes[:4] == b'\x89PNG':
+            self.avatar.loadFromData(img_bytes, format='PNG')
+        else:
+            self.avatar.loadFromData(img_bytes, format='jfif')
+        self.avatar.scaled(60, 60, Qt.IgnoreAspectRatio, Qt.SmoothTransformation)
+
+    def save_avatar(self, path=None):
+        if not self.avatar:
+            return
+        if path:
+            save_path = path
+        else:
+            os.makedirs('./data/avatar', exist_ok=True)
+            save_path = os.path.join(f'data/avatar/', self.wxid + '.png')
+        self.avatar_path = save_path
+        self.avatar.save(save_path)
+        print('保存头像', save_path)
+
 
 if __name__ == '__main__':
     p1 = MePC()
diff --git a/app/util/emoji.py b/app/util/emoji.py
index 31b63ba..ddafc5f 100644
--- a/app/util/emoji.py
+++ b/app/util/emoji.py
@@ -13,7 +13,7 @@ import traceback
 import xml.etree.ElementTree as ET
 import sqlite3
 import threading
-
+from PyQt5.QtGui import QPixmap
 import requests
 
 from app.log import log, logger
@@ -144,8 +144,6 @@ class Emotion:
 
 @log
 def download(url, output_dir, name, thumb=False):
-    if not url:
-        return ':/icons/icons/404.png'
     resp = requests.get(url)
     byte = resp.content
     image_format = get_image_format(byte[:8])
@@ -221,10 +219,16 @@ def get_emoji(xml_string, thumb=True, output_path=root_path) -> str:
             return output_path
         else:
             print("！！！未知表情包数据，信息：", xml_string, emoji_info, url)
-            return ""
+            output_path = os.path.join(output_path, '404.png')
+            if not os.path.exists(output_path):
+                QPixmap(':/icons/icons/404.png').save(output_path)
+            return output_path
     except:
         logger.error(traceback.format_exc())
-        return ""
+        output_path = os.path.join(output_path, "404.png")
+        if not os.path.exists(output_path):
+            QPixmap(':/icons/icons/404.png').save(output_path)
+        return output_path
 
 
 if __name__ == '__main__':