KaTeX Parse error

[arrocke]

Steps for Reproduction

1. Visit quilljs.com.
2. In the quill demo editor try to add a formula.
3. Type something invalid like \f.
4. Click save

Expected behavior:

Some kind of notification to the user that their formula was invalid.
This could take several forms:

• They are not able to click save unless formula is valid
• Show the formula as typed to indicate that it could not be parsed. This is what Dropbox paper does. That is the image below.

Actual behavior:

Nothing is added to the screen and and error is logged to the console.

Platforms:

I don't think this is a browser specific issue, but I'm running OS X 10.12.6 and Chrome 61.0.3163.100

Version:

1.2.6