parser error exposed to user given text block is empty line followed by a markdown quote

[phrohdoh]

On Athens version 1.0.0-beta.94 (Intel macOS, not M1) with a text block like the following (beginning with a markdown quote, so a >)

> hello world

Given my cursor is just before the >, when I hit shift+enter/return in order to insert a blank line above the quote I see the following

The title explicitly mentions "parser error" because when hovering over this now-broken block I get a tooltip (that cannot be captured visually, it seems).

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Attempting to add another quote (prior to the existing one), by typing in a >, leads to this error

Upon dismissing the error dialog (via OK button), Athens' clear/background color is all that renders (and macOS window stoplights), nothing else Athens UI. Athens must be restarted before it is usable again.