Have you checked these first?
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Help us help you: include your environment details. We've made this easy for you. Use the Copy System Info button in Admin Panel › osAwesome › Diagnostics, then paste below.
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[Sun Nov 20 14:14:31.884096 2022] [proxy_fcgi:error] [pid 10406:tid 139888644822784] [client 82.197.214.136:63422] AH01071: Got error 'PHP message: PHP Fatal error: Uncaught Error: Call to undefined method Validator::is_emailish() in /home/ticket/domains/support.domein.nl/private_html/scp/tickets.php:91\nStack trace:\n#0 {main}\n thrown in /home/ticket/domains/support.domein.nl/private_html/scp/tickets.php on line 91'
Without the theme it works.
any tips?
Found my anwser:
https://osticketawesome.com/forums/topic/search-is-broken-after-upgrade-to-1-17/
But also got the same behavior on the dataexport on a department page.