remove duplicate

src/app/services/chat/message.service.ts

@@ -77,7 +77,7 @@ export class MessageService {
     this.ts = ts
     this.u = u || { name: this.usernameToDisplayName(SessionStore.user.UserName), username: SessionStore.user.UserName, _id: ""}
     this.t = t
-    this._id = _id
+    this._id = _id || ""
     this._updatedAt = _updatedAt || new Date().getTime()
     this.file = file
     this.temporaryData = temporaryData

src/app/services/chat/room.service.ts

@@ -530,9 +530,9 @@ export class RoomService {
 
     this.message= ''
     
+    this.messagesLocalReference.push(localReference)
     const message: MessageService = await this.prepareCreate({message:offlineChatMessage, save: environment.chatOffline})
 
-    this.messagesLocalReference.push(localReference)
     await message.addMessageDB()
     message.send()
     
@@ -822,7 +822,33 @@ export class RoomService {
     wewMessage.setData(message)
     wewMessage.loadHistory = this.hasLoadHistory
 
-    this.messages.push(wewMessage)
+
+    let found;
+
+    if(wewMessage.localReference != null) {
+      found = this.messages.find((MessageService, index) => {
+        if ( MessageService.localReference == wewMessage.localReference ) {
+          return true
+        } else {
+          return false
+        }
+      })
+    } else {
+      found = this.messages.find((MessageService, index) => {
+        if ( MessageService._id == wewMessage._id) {
+          return true
+        } else {
+          return false
+        }
+      })
+    }
+    
+
+    if (!found) {
+      this.messages.push(wewMessage)
+      return  wewMessage
+    }
+
     return wewMessage
 
   }