**List of steps to reproduce** (step by step, including full links if applicable):
* install MediaWiki
* install the Minerva skin
* configure `$wgRightsIcon` and `$wgRightsText` (e.g. `"$wgResourceBasePath/resources/assets/licenses/cc-0.png"` and `"Creative Commons Zero (Public Domain)"`)
* don’t customize `$wgFooterIcons`
* load a page with the Minerva skin
To see it live:
* Open Not Wikilambda with the Minerva skin and `$wgFooterIcons` not configured, using [this link](https://notwikilambda.toolforge.org/w/index.php?useskin=minerva¬wikilambda-configure-wgFooterIcons=false)
**What happens?**:
```counterexample
MediaWiki internal error.
Original exception: [cd825e51c258fe8c7c6c8517] /w/index.php?title=Z10157&mobileaction=toggle_view_mobile TypeError: Return value of BaseTemplate::getCopyrightIconHTML() must be of the type string, array returned
Backtrace:
from /data/project/notwikilambda/public_html/w/includes/skins/BaseTemplate.php(60)
#0 /data/project/notwikilambda/public_html/w/includes/skins/SkinTemplate.php(382): BaseTemplate::getCopyrightIconHTML(GlobalVarConfig)
#1 /data/project/notwikilambda/public_html/w/skins/MinervaNeue/includes/Skins/SkinMinerva.php(125): SkinTemplate->prepareQuickTemplate()
#2 /data/project/notwikilambda/public_html/w/skins/MinervaNeue/includes/Skins/SkinMinerva.php(78): SkinMinerva->prepareQuickTemplate()
#3 /data/project/notwikilambda/public_html/w/includes/skins/SkinMustache.php(56): SkinMinerva->getTemplateData()
#4 /data/project/notwikilambda/public_html/w/includes/skins/SkinTemplate.php(144): SkinMustache->generateHTML()
#5 /data/project/notwikilambda/public_html/w/includes/OutputPage.php(2644): SkinTemplate->outputPage()
#6 /data/project/notwikilambda/public_html/w/includes/MediaWiki.php(939): OutputPage->output(boolean)
#7 /data/project/notwikilambda/public_html/w/includes/MediaWiki.php(952): MediaWiki::{closure}()
#8 /data/project/notwikilambda/public_html/w/includes/MediaWiki.php(559): MediaWiki->main()
#9 /data/project/notwikilambda/public_html/w/index.php(53): MediaWiki->run()
#10 /data/project/notwikilambda/public_html/w/index.php(46): wfIndexMain()
#11 {main}
```
**What should have happened instead?**:
No crash.
**Software version (if not a Wikimedia wiki), browser information, screenshots, other information, etc**:
MediaWiki core 01dea43, MinervaNeue be64114
---
I think this is a MediaWiki core bug. Here’s `BaseTemplate::getCopyrightIconHTML()`:
```lang=php,lines=10
/**
* @internal for usage by BaseTemplate or SkinTemplate.
* @param Config $config
* @return string
*/
public static function getCopyrightIconHTML( Config $config ): string {
$out = '';
$footerIcons = $config->get( 'FooterIcons' );
if (
isset( $footerIcons['copyright']['copyright'] ) &&
$footerIcons['copyright']['copyright']
) {
$out = $footerIcons['copyright']['copyright'];
} elseif ( $config->get( 'RightsIcon' ) ) {
$icon = htmlspecialchars( $config->get( 'RightsIcon' ) );
$url = $config->get( 'RightsUrl' );
if ( $url ) {
$out .= '<a href="' . htmlspecialchars( $url ) . '">';
}
$text = htmlspecialchars( $config->get( 'RightsText' ) );
$out .= "<img src=\"$icon\" alt=\"$text\" width=\"88\" height=\"31\" />";
if ( $url ) {
$out .= '</a>';
}
}
return $out;
}
```
This effectively returns `$wgFooterIcons['copyright']['copyright']`. And here’s the default value of `$wgFooterIcons`:
```lang=php,name=DefaultSettings.php
$wgFooterIcons = [
"copyright" => [
"copyright" => [], // placeholder for the built in copyright icon
],
"poweredby" => [
"mediawiki" => [
// Defaults to point at
// "$wgResourceBasePath/resources/assets/poweredby_mediawiki_88x31.png"
// plus srcset for 1.5x, 2x resolution variants.
"src" => null,
"url" => "https://www.mediawiki.org/",
"alt" => "Powered by MediaWiki",
]
],
];
```
`$wgFooterIcons['copyright']['copyright']` is an array. Returning it from `getCopyrightIconHTML()`, which declares a return type of `string`, will cause a crash.