1. Navigate to a thread with deleted comment-replies. 2. Switch to Classic View (non-nested) 3. Hover cursor over a member-reference of a deleted reply. (forum-thread-item-reference) - example below 4. Wait for any new comment to be posted to the topic. >> Black Hole Firefox: TypeError: "this.props.member is undefined" Chrome: TypeError: Cannot read property 'getIn' of undefined Chrome Error log: https://pastebin.com/JdPQtXnP Comment tested: https://robertsspaceindustries.com/spectrum/community/SC/forum/3/thread/so-that-q-a-did-nothing-but-confirm-that-cig-has-d/1466003 Step 3 example: Error details in console (Firefox):