The following produces an error and prompts me to report the issue:

1. Create a new table in Hasura web console and save it
2. Modify the table to add a new column user_id, specify that the column is not nullable (so uncheck the nullable box).
3. Click the "edit" button next to the new user_id column.
4. An error page appears, preventing the user_id column from being edited.

Editing other columns of the table seems to work fine.

(Using Hasura v1.0.0-beta.2)