Invalid char warning

I've caught a warning on page that displays a node:
Warning: DOMDocument::loadHTML() [domdocument.loadhtml]: Invalid char in CDATA 0xB in Entity, line: 1 in _elf_replace_callback() (line 152 of H:\vhosts\drupalspb\sites\all\modules\elf\elf.module).

Filter reacts strangely on the node body and d.org filters cut it off (may be it's encoding issue):
<ul><li><a href="http://drupal.org">из</a></li></ul>