Extension talk:Axiom

Detected bug in an extension!
I get the following output by Mediawiki 1.12.0 on Debian and Axion Version 20050901-9:

'''Detected bug in an extension! Hook wfAxiomInitPerPage failed to return a value; should return true to continue hook processing or false to abort.'''

Backtrace:
 * 1) 0 /var/www/mediawiki-1.12.0/includes/Parser.php(349): wfRunHooks('ParserBeforeStr...', Array)
 * 2) 1 /var/www/mediawiki-1.12.0/includes/Article.php(3174): Parser->parse(' '''MediaWi...', Object(Title), Object(ParserOptions), true, true, 4)
 * 3) 2 /var/www/mediawiki-1.12.0/includes/Article.php(821): Article->outputWikiText(' '''MediaWi...')
 * 4) 3 /var/www/mediawiki-1.12.0/includes/Wiki.php(390): Article->view
 * 5) 4 /var/www/mediawiki-1.12.0/includes/Wiki.php(48): MediaWiki->performAction(Object(OutputPage), Object(Article), Object(Title), Object(User), Object(WebRequest))
 * 6) 5 /var/www/mediawiki-1.12.0/index.php(90): MediaWiki->initialize(Object(Title), Object(OutputPage), Object(User), Object(WebRequest))
 * 7) 6 {main}

Why? How can I solve this problem?