Anki 2.1.45 Beta

This is the IO error I was getting (@dae is this something that can be fixed within Anki?)

Anki 2.1.45 (18843e71) Python 3.8.6 Qt 5.14.2 PyQt 5.14.2
Platform: Mac 10.16
Flags: frz=True ao=True sv=2
Add-ons, last update check: 2021-06-25 11:49:05

Caught exception:
Traceback (most recent call last):
File “aqt/webview.py”, line 41, in cmd
File “aqt/webview.py”, line 139, in _onCmd
File “aqt/webview.py”, line 603, in _onBridgeCmd
File “aqt/toolbar.py”, line 168, in _linkHandler
File “aqt/toolbar.py”, line 186, in _browseLinkHandler
File “aqt/main.py”, line 1117, in onBrowse
File “aqt/init.py”, line 101, in open
File “aqt/browser/browser.py”, line 106, in init
File “aqt/browser/browser.py”, line 385, in setupEditor
File “aqt/editor.py”, line 111, in init
File “aqt/editor.py”, line 134, in setupWeb
KeyError: ‘\n max-width’