codemirror.js:8236 Uncaught TypeError

Question

I have a simple html site including CodeMirror.

https://jsfiddle.net/xsxo0xmd/

Unfortunately I keep getting this error:

Uncaught TypeError: Cannot read property 'focused' of undefined
at Yo.prepareSelection (codemirror.js:8236)
at Yo.focus (codemirror.js:8321)
at new Po (codemirror.js:7266)
at Po (codemirror.js:7248)
at fiddle.jshell.net/:61

Any idea why this error occurs?

Answer 1

Turns out it's just an issue of the current version.