Unexpected non-MediaWiki exception encountered, of type "TypeError"
TypeError: implode(): Argument #2 ($array) must be of type ?array, string given in /home/bsbi/herbarium/htdocs/wk/languages/Language.php:2015
Stack trace:
#0 /home/bsbi/herbarium/htdocs/wk/languages/Language.php(2015): implode()
#1 /home/bsbi/herbarium/htdocs/wk/includes/Pager.php(533): Language->pipeList()
#2 /home/bsbi/herbarium/htdocs/wk/includes/specials/SpecialCategories.php(20): AlphabeticPager->getNavigationBar()
#3 /home/bsbi/herbarium/htdocs/wk/includes/SpecialPage.php(771): wfSpecialCategories()
#4 /home/bsbi/herbarium/htdocs/wk/includes/SpecialPage.php(559): SpecialPage->execute()
#5 /home/bsbi/herbarium/htdocs/wk/includes/Wiki.php(229): SpecialPage::executePath()
#6 /home/bsbi/herbarium/htdocs/wk/includes/Wiki.php(59): MediaWiki->initializeSpecialCases()
#7 /home/bsbi/herbarium/htdocs/wk/index.php(116): MediaWiki->initialize()
#8 {main}
#0 /home/bsbi/herbarium/htdocs/wk/languages/Language.php(2015): implode()
#1 /home/bsbi/herbarium/htdocs/wk/includes/Pager.php(533): Language->pipeList()
#2 /home/bsbi/herbarium/htdocs/wk/includes/specials/SpecialCategories.php(20): AlphabeticPager->getNavigationBar()
#3 /home/bsbi/herbarium/htdocs/wk/includes/SpecialPage.php(771): wfSpecialCategories()
#4 /home/bsbi/herbarium/htdocs/wk/includes/SpecialPage.php(559): SpecialPage->execute()
#5 /home/bsbi/herbarium/htdocs/wk/includes/Wiki.php(229): SpecialPage::executePath()
#6 /home/bsbi/herbarium/htdocs/wk/includes/Wiki.php(59): MediaWiki->initializeSpecialCases()
#7 /home/bsbi/herbarium/htdocs/wk/index.php(116): MediaWiki->initialize()
#8 {main}