Error on source edit with CodeMirror

[zertex]

If plugin installed I have error in console on try edit source: plugin.js?t=I639:44 Uncaught TypeError: Cannot read property 'getStartElement' of null at a.<anonymous> (plugin.js?t=I639:44) at a.h (ckeditor.js:10) at a.<anonymous> (ckeditor.js:11) at a.window.CKEDITOR.window.CKEDITOR.dom.CKEDITOR.editor.CKEDITOR.editor.fire (ckeditor.js:13) at plugin.js?t=I639:942 at codemirror.min.js:1 at dp (codemirror.min.js:1) at ck (codemirror.min.js:1) at aw (codemirror.min.js:1) at dh (codemirror.min.js:1)

PS used CodeMirror as source editor