diff --git a/electron-projects/ucap-webmessenger-electron/src/index.ts b/electron-projects/ucap-webmessenger-electron/src/index.ts
index 1ae23473..2734a605 100644
--- a/electron-projects/ucap-webmessenger-electron/src/index.ts
+++ b/electron-projects/ucap-webmessenger-electron/src/index.ts
@@ -549,10 +549,12 @@ ipcMain.on(
         if (!err) {
           event.returnValue = savePath;
         } else {
+          log.info('SaveFile err', err);
           event.returnValue = undefined;
         }
       });
     } catch (error) {
+      log.info('SaveFile error', error);
       event.returnValue = undefined;
     }
   }
diff --git a/projects/ucap-webmessenger-app/src/app/store/messenger/sync/reducers.ts b/projects/ucap-webmessenger-app/src/app/store/messenger/sync/reducers.ts
index 8c645c5c..163eb95f 100644
--- a/projects/ucap-webmessenger-app/src/app/store/messenger/sync/reducers.ts
+++ b/projects/ucap-webmessenger-app/src/app/store/messenger/sync/reducers.ts
@@ -82,7 +82,7 @@ export const reducer = createReducer(
     // tslint:disable-next-line: forin
     for (const key in state.room.entities) {
       const value = state.room.entities[key];
-      unReadCount += value.noReadCnt;
+      unReadCount += isNaN(value.noReadCnt) ? 0 : value.noReadCnt;
     }
     action.roomList.map(item => (unReadCount += item.noReadCnt));
 
@@ -304,7 +304,7 @@ export const reducer = createReducer(
       for (const key in state.room.entities) {
         if (key !== action.roomSeq) {
           const value = state.room.entities[key];
-          unReadCount += value.noReadCnt;
+          unReadCount += isNaN(value.noReadCnt) ? 0 : value.noReadCnt;
         }
       }
     } else {
diff --git a/projects/ucap-webmessenger-protocol-room/src/lib/protocols/info.ts b/projects/ucap-webmessenger-protocol-room/src/lib/protocols/info.ts
index 85622e51..9d76f066 100644
--- a/projects/ucap-webmessenger-protocol-room/src/lib/protocols/info.ts
+++ b/projects/ucap-webmessenger-protocol-room/src/lib/protocols/info.ts
@@ -89,7 +89,7 @@ export const decodeInfoData: ProtocolDecoder<InfoData> = (
         finalEventMessage: info[4],
         finalEventDate: info[5],
         joinUserCount: Number(info[6]),
-        noReadCnt: Number(info[7]),
+        noReadCnt: isNaN(info[7]) ? 0 : Number(info[7]),
         receiveAlarm: info[8] !== 'N' ? true : false,
         isJoinRoom: info[9] === 'Y' ? true : false,
         expiredFileStdSeq: Number(info[10]),
diff --git a/projects/ucap-webmessenger-protocol-sync/src/lib/protocols/room.ts b/projects/ucap-webmessenger-protocol-sync/src/lib/protocols/room.ts
index 02e5dd76..97a80292 100644
--- a/projects/ucap-webmessenger-protocol-sync/src/lib/protocols/room.ts
+++ b/projects/ucap-webmessenger-protocol-sync/src/lib/protocols/room.ts
@@ -83,7 +83,7 @@ export const decodeRoomData: ProtocolDecoder<RoomData> = (
         finalEventMessage: info[4],
         finalEventDate: info[5],
         joinUserCount: Number(info[6]),
-        noReadCnt: Number(info[7]),
+        noReadCnt: isNaN(info[7]) ? 0 : Number(info[7]),
         receiveAlarm: info[8] !== 'N' ? true : false,
         isJoinRoom: info[9] === 'Y' ? true : false,
         expiredFileStdSeq: Number(info[10]),
diff --git a/projects/ucap-webmessenger-ui-chat/src/lib/components/messages.component.ts b/projects/ucap-webmessenger-ui-chat/src/lib/components/messages.component.ts
index aa5608b5..9f481c02 100644
--- a/projects/ucap-webmessenger-ui-chat/src/lib/components/messages.component.ts
+++ b/projects/ucap-webmessenger-ui-chat/src/lib/components/messages.component.ts
@@ -178,6 +178,13 @@ export class MessagesComponent implements OnInit, OnDestroy {
       this.loginRes = loginRes;
     });
     this.roomInfoSubscription = this.roomInfo$.subscribe(roomInfo => {
+      if (
+        !this.roomInfo ||
+        (!!this.roomInfo && this.roomInfo.roomSeq !== roomInfo.roomSeq)
+      ) {
+        this.baseEventSeq = 0;
+      }
+
       this.roomInfo = roomInfo;
       this.showMore = false;
 
@@ -196,7 +203,6 @@ export class MessagesComponent implements OnInit, OnDestroy {
         !this.roomInfo ||
         (!!this.roomInfo && this.roomInfo.roomSeq !== roomInfo.roomSeq)
       ) {
-        this.baseEventSeq = 0;
         this.initEventMore();
       }
     });