Browser: Opera, Chrome (latest ver as of 5/24/21) Repro rate: 100% Repro steps: 1. User 1 create topic in Community forum 2. User 2 respond with comment on User 1's topic 3. User 2 delete comment 4. User 1 view notifications after User 2 deletes comment User 1 receives notification that User 2 commented on User 1's topic even if comment is deleted before User 1 views notifications. Clicking on notification does not handle gracefully; User 1 is taken to blank page with infinite loading screen and pop-up error indicating comment has been deleted. Expected behavior: User 1 is returned to topic and is able to view topic/comments, as well as pop-up error indicating deleted comment, rather than being returned to a blank loading page. Example: https://www.proko.com/community/topics/how-can-you-tell-when-you-ve-mastered-the-basics-enough-to-move-on#37622337462471261.66108840961971261.62624831819881261