Special:Preferences on gu.wiki:
http://gu.wikipedia.org/wiki/Special:Preferences
It is showing an error message:
Global default '1' is invalid for field math
Backtrace:
#0 /usr/local/apache/common-local/php-1.17/includes/Preferences.php(1154): Preferences::getPreferences(Object(User))
#1 /usr/local/apache/common-local/php-1.17/includes/specials/SpecialPreferences.php(70): Preferences::getFormObject(Object(User))
#2 /usr/local/apache/common-local/php-1.17/includes/SpecialPage.php(579): SpecialPreferences->execute(NULL)
#3 /usr/local/apache/common-local/php-1.17/includes/Wiki.php(250): SpecialPage::executePath(Object(Title))
#4 /usr/local/apache/common-local/php-1.17/includes/Wiki.php(63): MediaWiki->handleSpecialCases(Object(Title), Object(OutputPage), Object(WebRequest))
#5 /usr/local/apache/common-local/php-1.17/index.php(114): MediaWiki->performRequestForTitle(Object(Title), NULL, Object(OutputPage), Object(User), Object(WebRequest))
#6 /usr/local/apache/common-local/live-1.5/index.php(3): require('/usr/local/apac...')
#7 {main}
Version: unspecified
Severity: major