On render: Column must be greater than or equal to 0, got -1 mailer

[mikepaszkiewicz]

Getting this error intermittently on our production servers on email render. Tried cloning the db & replicating locally, but couldn't get a reproduction.

Could not render email before sending: Column must be greater than or equal to 0, got -1 mailer

[johanbrook]

Hm, that's weird. That feels like a parsing error in the HTML or html-to-text package. Is your markup wonky somewhere?