Invalid Argument

I am getting the following error:

Warning: Invalid argument supplied for foreach() in my-site/wp-content/plugins/meta-box-aio/extensions/meta-box-builder/inc/parsers/meta-box.php on line 78

Warning: Cannot modify header information - headers already sent by (output started at my-site/wp-content/plugins/meta-box-aio/extensions/meta-box-builder/inc/parsers/meta-box.php:78) in my-site/wp-includes/pluggable.php on line 1219

Steps to recreate:
1. Create a new custom Field Group
2. Add the default text box (use default settings)
3. Click Publish
4. I get the error

This was working earlier today in my remote dev environment. I cannot reproduce the error in my local dev environment. Plugins are all up-to-date.

The trace directs me to a function that seems to process tabs, so I disabled the tabs extensions. I still get the error.

I don't know what else to try at this point. Anyone have any ideas?