Fatal error: Uncaught TypeError: strtolower(): Argument #1 ($string) must be of type string, array given in /home/bell-school.ch/deployer/releases/15/public_html/wp-includes/class-wp-term-query.php:922
Stack trace:
#0 /home/bell-school.ch/deployer/releases/15/public_html/wp-includes/class-wp-term-query.php(922): strtolower()
#1 /home/bell-school.ch/deployer/releases/15/public_html/wp-includes/class-wp-term-query.php(451): WP_Term_Query->parse_orderby()
#2 /home/bell-school.ch/deployer/releases/15/public_html/wp-includes/class-wp-term-query.php(311): WP_Term_Query->get_terms()
#3 /home/bell-school.ch/deployer/releases/15/public_html/wp-includes/taxonomy.php(1332): WP_Term_Query->query()
#4 /home/bell-school.ch/deployer/releases/15/public_html/wp-content/themes/bell-english/app/vendor/timber/timber/lib/TermGetter.php(80): get_terms()
#5 /home/bell-school.ch/deployer/releases/15/public_html/wp-content/themes/bell-english/app/vendor/timber/timber/lib/TermGetter.php(50): Timber\TermGetter::handle_term_query()
#6 /home/bell-school.ch/deployer/releases/15/public_html/wp-content/themes/bell-english/app/vendor/timber/timber/lib/Timber.php(189): Timber\TermGetter::get_terms()
#7 /home/bell-school.ch/deployer/releases/15/public_html/wp-content/themes/bell-english/taxonomy-help-centre-category.php(21): Timber\Timber::get_terms()
#8 /home/bell-school.ch/deployer/releases/15/public_html/wp-includes/template-loader.php(106): include('...')
#9 /home/bell-school.ch/deployer/releases/15/public_html/wp-blog-header.php(19): require_once('...')
#10 /home/bell-school.ch/deployer/releases/15/public_html/index.php(17): require('...')
#11 {main}
thrown in /home/bell-school.ch/deployer/releases/15/public_html/wp-includes/class-wp-term-query.php on line 922
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