diff --git a/src/app/chat/chat-view/chat-view.component.ts b/src/app/chat/chat-view/chat-view.component.ts
index b43290e..68825e0 100644
--- a/src/app/chat/chat-view/chat-view.component.ts
+++ b/src/app/chat/chat-view/chat-view.component.ts
@@ -61,9 +61,7 @@ export class ChatViewComponent implements OnInit, OnDestroy {
 
   ngOnInit() {
     this.routeParamsSub = this.route.params.subscribe(params => {
-      if (this.messagesSub) {
-        this.messagesSub.unsubscribe();
-      }
+      this.unsubscribeChannel();
       this.isFirstLoad = true;
       this.messages = undefined;
 
@@ -172,16 +170,22 @@ export class ChatViewComponent implements OnInit, OnDestroy {
     }
   }
 
-  ngOnDestroy() {
-    if (this.chatContentScrollSubscription) {
-      this.chatContentScrollSubscription.unsubscribe();
-    }
+
+  unsubscribeChannel() {
+    this.chatService.unsubscribeMessagesSubscription();
     if (this.messagesSub) {
       this.messagesSub.unsubscribe();
     }
     if (this.channelSub) {
       this.channelSub.unsubscribe();
     }
+  }
+
+  ngOnDestroy() {
+    if (this.chatContentScrollSubscription) {
+      this.chatContentScrollSubscription.unsubscribe();
+    }
+    this.unsubscribeChannel();
     if (this.routeParamsSub) {
       this.routeParamsSub.unsubscribe();
     }
diff --git a/src/app/chat/services/chat/chat.service.ts b/src/app/chat/services/chat/chat.service.ts
index 9a4c1bf..3b35177 100644
--- a/src/app/chat/services/chat/chat.service.ts
+++ b/src/app/chat/services/chat/chat.service.ts
@@ -1,14 +1,14 @@
 import 'rxjs/add/operator/do';
-import { Injectable } from '@angular/core';
-import { Apollo, ApolloQueryObservable } from 'apollo-angular';
-import { AuthenticationService } from '../../../shared/services/authentication.service';
-import { ApolloQueryResult } from 'apollo-client';
-import { sendMessageMutation } from '../../../graphql/queries/send-message.mutation';
-import { messagesQuery } from '../../../graphql/queries/messages.query';
-import { chatMessageAddedSubscription } from '../../../graphql/queries/chat-message-added.subscription';
-import { ChannelByNameQuery, MessagesQuery } from '../../../graphql/types/types';
-import { channelByNameQuery } from '../../../graphql/queries/channel-by-name.query';
-import { Observable } from 'rxjs/Observable';
+import {Injectable} from '@angular/core';
+import {Apollo, ApolloQueryObservable} from 'apollo-angular';
+import {AuthenticationService} from '../../../shared/services/authentication.service';
+import {ApolloQueryResult} from 'apollo-client';
+import {sendMessageMutation} from '../../../graphql/queries/send-message.mutation';
+import {messagesQuery} from '../../../graphql/queries/messages.query';
+import {chatMessageAddedSubscription} from '../../../graphql/queries/chat-message-added.subscription';
+import {ChannelByNameQuery, MessagesQuery} from '../../../graphql/types/types';
+import {channelByNameQuery} from '../../../graphql/queries/channel-by-name.query';
+import {Observable} from 'rxjs/Observable';
 
 @Injectable()
 export class ChatService {
@@ -16,6 +16,7 @@ export class ChatService {
   private noMoreToLoad = false;
   private loadingMoreMessages = false;
   private messagesQueryObservable: ApolloQueryObservable<MessagesQuery.Result>;
+  private messagesSubscriptionObservable;
   private user;
 
   constructor(private apollo: Apollo,
@@ -55,7 +56,7 @@ export class ChatService {
         },
         optimisticResponse: this.optimisticSendMessage(content),
         updateQueries: {
-          messages: (previousResult: any, { mutationResult }: any) => {
+          messages: (previousResult: any, {mutationResult}: any) => {
             const message = mutationResult.data.sendMessage;
             return this.pushNewMessage(previousResult, message);
           }
@@ -88,7 +89,7 @@ export class ChatService {
       throw new Error('call getMessages() first');
     }
 
-    this.apollo.subscribe({
+    this.messagesSubscriptionObservable = this.apollo.subscribe({
       query: chatMessageAddedSubscription,
       variables: {
         channelId,
@@ -102,6 +103,12 @@ export class ChatService {
     });
   }
 
+  unsubscribeMessagesSubscription() {
+    if ( this.messagesSubscriptionObservable){
+      this.messagesSubscriptionObservable.unsubscribe();
+    }
+  }
+
   loadMoreMessages(channelId: string, count: number): Promise<ApolloQueryResult<MessagesQuery.Result>> {
     if (!this.messagesQueryObservable) {
       return Promise.reject('call getMessages() first');
@@ -118,7 +125,7 @@ export class ChatService {
         cursor: this.cursor,
         count,
       },
-      updateQuery: (prev, { fetchMoreResult }) => {
+      updateQuery: (prev, {fetchMoreResult}) => {
         this.cursor = fetchMoreResult.messages.cursor;
         this.loadingMoreMessages = false;
 
@@ -148,7 +155,8 @@ export class ChatService {
   private pushNewMessage(prev, newMessage) {
     let result;
 
-    if (prev.messages.messagesArray[prev.messages.messagesArray.length - 1].id === newMessage.id) {
+    const prevMessagesLen = prev.messages.messagesArray.length;
+    if (prevMessagesLen && prev.messages.messagesArray[prevMessagesLen - 1].id === newMessage.id) {
       result = prev;
     }
     else {
diff --git a/src/app/shared/shared.module.ts b/src/app/shared/shared.module.ts
index c77d085..907d70b 100644
--- a/src/app/shared/shared.module.ts
+++ b/src/app/shared/shared.module.ts
@@ -29,7 +29,7 @@ import { DefaultAvatarPipe } from './pipes/default-avatar/default-avatar.pipe';
     DefaultAvatarPipe
   ],
   declarations: [UnixTimeToStringPipe, DefaultAvatarPipe],
-  providers: [PushNotificationsService, LoginPageService],
+  providers: [PushNotificationsService],
 })
 export class SharedModule {
 }