Random "Critical Error" Message in Cornerstone Builder I've Never Seen Before

I keep getting this random “critical error” message I’ve never ever seen before in the builder. (See screenshot.) I have tried just about everything (deactivating plugins, removing all custom code, etc.) and it keeps happening. The other weird thing is that it will show the error message, and then when I immediately save again right afterward it sometimes saves?

Any explanation or anyone else getting this same thing?

Hello @leighgen,

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