filemtime(): stat failed ckeditor.config.js

When using a tool like getsentry we go a lot of warnings:

filemtime(): stat failed for /sites/all/modules/contrib/ckeditor/ckeditor.config.js

The problem occurs on line 584. And the issue is that @filemtime($module_drupal_path . "/ckeditor.config.js") where it looks at an absolute path on the server and not a relative one.

I solved it buy changing it into @filemtime($module_drupal_local_path . "/ckeditor.config.js").

I don't know if this is the right way to solve this but open for suggestions.

Voudun