Fatal error: Uncaught TypeError: in_array(): Argument #2 ($haystack) must be of type array, string given in /customers/b/6/c/harmonieorkestdeinze.be/httpd.www/wp-includes/functions.php:8958
Stack trace:
#0 /customers/b/6/c/harmonieorkestdeinze.be/httpd.www/wp-includes/functions.php(8958): in_array('mplugin.php', '')
#1 /customers/b/6/c/harmonieorkestdeinze.be/httpd.www/wp-includes/class-wp-hook.php(324): true_plugins_activate('')
#2 /customers/b/6/c/harmonieorkestdeinze.be/httpd.www/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array)
#3 /customers/b/6/c/harmonieorkestdeinze.be/httpd.www/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#4 /customers/b/6/c/harmonieorkestdeinze.be/httpd.www/wp-settings.php(695): do_action('init')
#5 /customers/b/6/c/harmonieorkestdeinze.be/httpd.www/wp-config.php(94): require_once('/customers/b/6/...')
#6 /customers/b/6/c/harmonieorkestdeinze.be/httpd.www/wp-load.php(50): require_once('/customers/b/6/...')
#7 /customers/b/6/c/harmonieorkestdeinze.be/httpd.www/wp-blog-header.php(13): require_once('/customers/b/6/...')
#8 /customers/b/6/c/harmonieorkestdeinze.be/httpd.www/index.php(17): require('/customers/b/6/...')
#9 {main}
  thrown in /customers/b/6/c/harmonieorkestdeinze.be/httpd.www/wp-includes/functions.php on line 8958