Fehlermeldung nach Update auf Contao 3.5.16

Fatal error: Uncaught exception Exception with message Query error: Duplicate entry '2fd4ca6f5d3c3bc54fe9ffe76ff43262-2' for key 'checksum_pid'
(INSERT INTO tl_search (tstamp, url, title, protected, filesize, groups, pid, language, text, checksum) VALUES (1473164677,

)) thrown in system/modules/core/library/Contao/Database/Statement.php on line 295

#0 system/modules/core/library/Contao/Database/Statement.php(264): Contao\Database\Statement->query()
#1 system/modules/core/library/Contao/Search.php(214): Contao\Database\Statement->execute()
#2 system/modules/core/classes/FrontendTemplate.php(330): Contao\Search::indexPage(Array)
#3 system/modules/core/classes/FrontendTemplate.php(124): Contao\FrontendTemplate->addToSearchIndex()
#4 system/modules/core/pages/PageRegular.php(190): Contao\FrontendTemplate->output(true)
#5 system/modules/core/controllers/FrontendIndex.php(285): Contao\PageRegular->generate(Object(Contao\PageModel), true)
#6 index.php(20): Contao\FrontendIndex->run()
#7 {main}