2 files changed, 11 insertions, 5 deletions
diff --git a/webapp/components/post_view/post_view_cache.jsx b/webapp/components/post_view/post_view_cache.jsx
index c1b278c35..3b6123b09 100644
--- a/webapp/components/post_view/post_view_cache.jsx
+++ b/webapp/components/post_view/post_view_cache.jsx
@@ -17,11 +17,12 @@ export default class PostViewCache extends React.Component {
 
         this.onChannelChange = this.onChannelChange.bind(this);
 
+        const currentChannelId = ChannelStore.getCurrentId();
         const channel = ChannelStore.getCurrent();
 
         this.state = {
-            currentChannelId: channel.id,
-            channels: [channel]
+            currentChannelId,
+            channels: channel ? [channel] : []
         };
     }
 
@@ -40,7 +41,7 @@ export default class PostViewCache extends React.Component {
         const channels = Object.assign([], this.state.channels);
         const currentChannel = ChannelStore.getCurrent();
 
-        if (currentChannel == null) {
+        if (!currentChannel) {
             return;
         }
 
diff --git a/webapp/components/post_view/post_view_controller.jsx b/webapp/components/post_view/post_view_controller.jsx
index 57b488b54..53cd0b28c 100644
--- a/webapp/components/post_view/post_view_controller.jsx
+++ b/webapp/components/post_view/post_view_controller.jsx
@@ -202,8 +202,13 @@ export default class PostViewController extends React.Component {
         }
     }
 
-    onSetNewMessageIndicator(lastViewed, ownNewMessage) {
-        this.setState({lastViewed, ownNewMessage});
+    onSetNewMessageIndicator() {
+        let lastViewed = Number.MAX_VALUE;
+        const member = ChannelStore.getMyMember(this.props.channel.id);
+        if (member != null) {
+            lastViewed = member.last_viewed_at;
+        }
+        this.setState({lastViewed});
     }
 
     onPostListScroll(atBottom) {