```
[2020-12-09T16:25:30.815994+00:00] error.ERROR: [878070bb351b8a93e3efcd1b] /wiki/Special:ManageTranslatorSandbox ErrorException from line 1063 of /srv/mediawiki/tags/2020-12-09_14:30:39/includes/skins/Skin.php: PHP Notice: Undefined index: alt {"exception":"[object] (ErrorException(code: 0): PHP Notice: Undefined index: alt at /srv/mediawiki/tags/2020-12-09_14:30:39/includes/skins/Skin.php:1063)
[stacktrace]
#0 /srv/mediawiki/tags/2020-12-09_14:30:39/includes/skins/Skin.php(1063): MWExceptionHandler::handleError(8, 'Undefined index...', '/srv/mediawiki/...', 1063, Array)
#1 /srv/mediawiki/tags/2020-12-09_14:30:39/skins/MonoBook/includes/MonoBookTemplate.php(542): Skin->makeFooterIcon(Array)
#2 /srv/mediawiki/tags/2020-12-09_14:30:39/skins/MonoBook/includes/MonoBookTemplate.php(127): MonoBookTemplate->getSimpleFooter()
#3 /srv/mediawiki/tags/2020-12-09_14:30:39/includes/skins/SkinTemplate.php(123): MonoBookTemplate->execute()
#4 /srv/mediawiki/tags/2020-12-09_14:30:39/includes/skins/SkinTemplate.php(138): SkinTemplate->generateHTML()
#5 /srv/mediawiki/tags/2020-12-09_14:30:39/includes/OutputPage.php(2626): SkinTemplate->outputPage()
#6 /srv/mediawiki/tags/2020-12-09_14:30:39/includes/MediaWiki.php(952): OutputPage->output(true)
#7 /srv/mediawiki/tags/2020-12-09_14:30:39/includes/MediaWiki.php(965): MediaWiki->{closure}()
#8 /srv/mediawiki/tags/2020-12-09_14:30:39/includes/MediaWiki.php(548): MediaWiki->main()
#9 /srv/mediawiki/tags/2020-12-09_14:30:39/index.php(53): MediaWiki->run()
#10 /srv/mediawiki/tags/2020-12-09_14:30:39/index.php(46): wfIndexMain()
#11 {main}
","exception_id":"878070bb351b8a93e3efcd1b","exception_url":"/wiki/Special:ManageTranslatorSandbox","caught_by":"mwe_handler"} []
```
# Replication steps
Configure LocalSettings.php with the following and view any Monobook page.
```
error_reporting( -1 );
ini_set( 'display_errors', 1 );
ini_set( 'display_startup_errors', 1 );
$wgDeprecationWarnings = true;
$wgShowExceptionDetails = true;
$wgDevelopmentWarnings = true;
$wgRightsPage = null;
$wgRightsUrl = null;
$wgFooterIcons = [
"copyright"=> [
"copyright"=> [ ]
],
"poweredby" => [
[
"url"=>"http://www.netcup.de/",
"alt"=>"Powered by netcup - netcup.de – Webhosting, vServer, Servermanagement"
],
[
"src"=> "https://translatewiki.net/static/spi.svg",
"alt"=> "Software in the Public Interest associated project",
"url"=>"https://www.spi-inc.org/projects/translatewiki.net/",
"height"=>"31",
"width"=>false,
],
"mediawiki"=> [
"src"=>"/w/resources/assets/poweredby_mediawiki_88x31.png",
"url"=>"https://www.mediawiki.org/",
"alt"=>"Powered by MediaWiki",
"srcset"=>"/w/resources/assets/poweredby_mediawiki_132x47.png 1.5x, /w/resources/assets/poweredby_mediawiki_176x62.png 2x"
],
"semanticmediawiki"=> [
"src"=> "data:image/png;base64,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",
"url"=>"https://www.semantic-mediawiki.org/wiki/Semantic_MediaWiki",
"alt"=>"Powered by Semantic MediaWiki",
"class"=> "smw-footer",
]
],
"netcup"=> [
"<div class='mw_poweredby'><a href=\"http://www.netcup.de/\" title=\"Powered by netcup - netcup.de – Webhosting, vServer, Servermanagement\" target=\"_blank\">Powered by netcup - netcup.de – Webhosting, vServer, Servermanagement</a></div>"
]
];
```