List of steps to reproduce (step by step, including full links if applicable):
On deployment-mwmaint02:
PHP=php7.4 mwscript extensions/WikimediaMaintenance/blameStartupRegistry.php --wiki=enwiki
What happens?:
2022-06-16 03:22:37 [f41c44897b8a7a9d1b2a8f07] deployment-mwmaint02 enwiki 1.39.0-alpha error ERROR: [f41c44897b8a7a9d1b2a8f07] [no req] PHP Notice: Trying to access array offset on value of type bool {"exception_url":"[no req]","reqId":"f41c44897b8a7a9d1b2a8f07","caught_by":"mwe_handler"}
[Exception ErrorException] (/srv/mediawiki/php-master/includes/ResourceLoader/SkinModule.php:705) PHP Notice: Trying to access array offset on value of type bool
#0 /srv/mediawiki/php-master/includes/ResourceLoader/SkinModule.php(705): MWExceptionHandler::handleError(integer, string, string, integer, array)
#1 /srv/mediawiki/php-master/includes/ResourceLoader/FileModule.php(630): MediaWiki\ResourceLoader\SkinModule->getLessVars(MediaWiki\ResourceLoader\DerivativeContext)
#2 /srv/mediawiki/php-master/includes/ResourceLoader/SkinModule.php(715): MediaWiki\ResourceLoader\FileModule->getDefinitionSummary(MediaWiki\ResourceLoader\DerivativeContext)
#3 /srv/mediawiki/php-master/includes/ResourceLoader/Module.php(934): MediaWiki\ResourceLoader\SkinModule->getDefinitionSummary(MediaWiki\ResourceLoader\DerivativeContext)
#4 /srv/mediawiki/php-master/includes/ResourceLoader/ResourceLoader.php(1134): MediaWiki\ResourceLoader\Module->getVersionHash(MediaWiki\ResourceLoader\DerivativeContext)
#5 /srv/mediawiki/php-master/extensions/WikimediaMaintenance/blameStartupRegistry.php(139): MediaWiki\ResourceLoader\ResourceLoader->makeModuleResponse(MediaWiki\ResourceLoader\DerivativeContext, array)
#6 /srv/mediawiki/php-master/maintenance/includes/MaintenanceRunner.php(195): BlameStartupRegistry->execute()
#7 /srv/mediawiki/php-master/maintenance/doMaintenance.php(85): MediaWiki\Maintenance\MaintenanceRunner->run()
#8 /srv/mediawiki/php-master/extensions/WikimediaMaintenance/blameStartupRegistry.php(336): require_once(string)
#9 /srv/mediawiki/multiversion/MWScript.php(123): require_once(string)
#10 {main}What should have happened instead?:
Execution without an error.
Software version (if not a Wikimedia wiki), browser information, screenshots, other information, etc.:
3v4l confirms that false['s'] gives a notice on PHP 7.4.0+ and is silent on earlier versions. $wmgSiteLogoWordmark is set to false in InitialiseSettings-labs.php and so $logos['wordmark'] is false in getLessVars(). The documentation for $wgLogos['wordmark'] just says that it should be an array.