A break can occur when you view the managed members list while another user adds members.
1. In 2 separate Chrome sessions, login as different users viewing the same channel.
2. Ensure the channel does not already have a post from the user to be added to the channel.
3. As UserA, refresh the page (to clear any cache from viewing other channels), then open the manage members and leave the modal open.
3. As UserB open the manage members list and add a user.
Expected: *UserA * can see the newly added user
You may need to repeat step 3 a few times.
TypeError: Cannot read property 'delete_at' of undefined
See Screen Attached.
Steps as updated in issue are accurate capture steps.