CB Conditional breaks site when enabled

Everything was working fine. Then I got this first error screen. Removed everything one by one, completely destroyed site. 3 Weeks of work gone.

Start over from scratch 5 days ago.

Latests Joomla, latest CB and plugins. Everything was fine and then when I went to edit a profile I get the same original error screen.

Unpublished everything and re-enabled one by one in several different conbinations. Conditionals breaks the site every time. Updated to the latest Conditionals nightly, same result. Is this a bad conditional rule? There is nothing in page source, developer console just times out.

Plus groupjive gives error warnings in plugin manager, cannot create new groups, or create new images, videos, audio, files in the CB gallery but I haven't even got started on that issue yet...

Looks like there's a query for the username, but the ID is missing entirely. Do you have a CB Query Field querying for the username? If so ensure the substitution is surrounded by quotes. For example it should be '[user_id]' as substitutions should always be assumed as strings. Please also ensure you are not conditioning the edit display of core fields like Username, Email, Name, or Password.