Markdown parsing exception

[MHuiG]

If you want to report a bug, please provide the following information:

• The steps to reproduce.

1. Go to https://valine.js.org/
2. Enter this

[https://valine.js.org/](https://valine.js.org/)

3. See bug

• A minimal demo of the problem via https://jsfiddle.net or http://codepen.io/pen if possible.

https://valine.js.org/

• Which versions of Valine, and which browser / OS are affected by this issue?

v1.4.4

all/all

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#275