FixedColumns example - jQuery UI themed table - throws error when filtering

If You go to https://www.datatables.net/release-datatables/extras/FixedColumns/themed.html and start typing in search (for example "mi") only right part of Datatable is filtered.

Also there is an error in Console:

Uncaught TypeError: Cannot read property 'className' of undefined FixedColumns.js:796
(anonymous function) FixedColumns.js:796
p.extend.each jquery.js:2
p.fn.p.each jquery.js:2
FixedColumns._fnClone FixedColumns.js:795
FixedColumns._fnCloneLeft FixedColumns.js:673
FixedColumns._fnDraw FixedColumns.js:608
s.dt.aoDrawCallback.fn FixedColumns.js:450
_fnCallbackFire jquery.dataTables.js:4851
_fnDraw jquery.dataTables.js:1566
_fnFilterComplete jquery.dataTables.js:2184
(anonymous function) jquery.dataTables.js:2112
p.event.dispatch jquery.js:2
g.handle.h jquery.js:2

Main example (https://www.datatables.net/release-datatables/extras/FixedColumns/index.html) is working fine, but styled throws that error.

If this is duplicate bug report please excuse me.