CKEditor exception whilst using the PasteFromWord plugin

I've recently upgraded to the latest version of CKEditor 4, and have hit this exception which I can't seem to solve:

Unhandled exception at line 5, column 105 in file:///ScriptsLibrary/ckeditor/plugins/pastefromword/filter/default.js
0x800a138f - JavaScript runtime error: Unable to get property 'styles' of undefined or null reference

This exception arises from the following snippet of code, located in default.js, inside the PasteFromWord plugin:

(function(){function r(){return!1}var n=CKEDITOR.tools,B=CKEDITOR.plugins.pastetools,t=B.filters.common,k=t.styles ...

The actual exception is due to the styles object not existing:

CKEDITOR.plugins.pastetools.filters.common.styles

Any help on this issue would be greatly appreciated!