Thread:Project:Support desk/mw-config call back error after updating from 1.22.2 to 1.22.4

Reported in bug report #62697

PHP	5.4.4-14+deb7u7 (apache2handler) MySQL	5.5.33-0+wheezy1

Updating from 1.22.2 to 1.22.4

Steps to Reproduce: 1.Starting with a working 1.22.2 install, downloaded 1.22.4 2. Merged new files 3. Ran update.php 4. In browser went to mw-config, selected language and got error

Actual Results: After selecting English the following traceback was generated

Existing wiki

[3ca6b40a] /wiki/mw-config/?page=ExistingWiki Exception from line 181 of /usr/share/mediawiki-1.22.4/includes/Hooks.php: Invalid callback in hooks for ParserFirstCallInit Backtrace:
 * 1) 0 /usr/share/mediawiki-1.22.4/includes/GlobalFunctions.php(3877): Hooks::run(string, array)
 * 2) 1 /usr/share/mediawiki-1.22.4/includes/parser/Parser.php(275): wfRunHooks(string, array)
 * 3) 2 /usr/share/mediawiki-1.22.4/includes/parser/Parser.php(287): Parser->firstCallInit
 * 4) 3 /usr/share/mediawiki-1.22.4/includes/parser/Parser.php(4823): Parser->clearState
 * 5) 4 /usr/share/mediawiki-1.22.4/includes/parser/Parser.php(367): Parser->startParse(Title, ParserOptions, integer, boolean)
 * 6) 5 /usr/share/mediawiki-1.22.4/includes/installer/Installer.php(608): Parser->parse(string, Title, ParserOptions, boolean)
 * 7) 6 /usr/share/mediawiki-1.22.4/includes/installer/WebInstaller.php(662): Installer->parse(string, boolean)
 * 8) 7 /usr/share/mediawiki-1.22.4/includes/installer/WebInstallerPage.php(359): WebInstaller->getInfoBox(string)
 * 9) 8 /usr/share/mediawiki-1.22.4/includes/installer/WebInstallerPage.php(347): WebInstaller_ExistingWiki->showKeyForm
 * 10) 9 /usr/share/mediawiki-1.22.4/includes/installer/WebInstaller.php(275): WebInstaller_ExistingWiki->execute
 * 11) 10 /usr/share/mediawiki-1.22.4/mw-config/index.php(61): WebInstaller->execute(array)
 * 12) 11 /usr/share/mediawiki-1.22.4/mw-config/index.php(29): wfInstallerMain
 * 13) 12 {main}

I have rolled back to 1.22, but any ideas where to look?