Fatal error: Uncaught TypeError: Argument 1 passed to WP_Translation_Controller::set_locale() must be of the type string, null given, called in /home/klient.dhosting.pl/kas/iee.org.pl/public_html/wp-includes/l10n.php on line 799 and defined in /home/klient.dhosting.pl/kas/iee.org.pl/public_html/wp-includes/l10n/class-wp-translation-controller.php:87
Stack trace:
#0 /home/klient.dhosting.pl/kas/iee.org.pl/public_html/wp-includes/l10n.php(799): WP_Translation_Controller->set_locale(NULL)
#1 /home/klient.dhosting.pl/kas/iee.org.pl/public_html/wp-content/plugins/polylang/include/olt-manager.php(106): load_textdomain('ulf', '/home/klient.dh...')
#2 /home/klient.dhosting.pl/kas/iee.org.pl/public_html/wp-includes/class-wp-hook.php(326): PLL_OLT_Manager->load_textdomains('uncategorized')
#3 /home/klient.dhosting.pl/kas/iee.org.pl/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array)
#4 /home/klient.dhosting.pl/kas/iee.org.pl/public_html/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#5 /home/ in /home/klient.dhosting.pl/kas/iee.org.pl/public_html/wp-includes/l10n/class-wp-translation-controller.php on line 87
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