A PHP error was encountered

Message:

Undefined array key 1

Location:

/var/www/vhosts/bol-chat.de/httpdocs/new/chat_types/includes/usonline.php on line 61

Trace:

#1 /var/www/vhosts/bol-chat.de/httpdocs/new/chat_types/includes/usonline.php(61): {closure}()
#2 /var/www/vhosts/bol-chat.de/httpdocs/new/templates/matrimonial/system/elements/template/sidebar-bottom.php(59): include_once('...')
#3 /var/www/vhosts/bol-chat.de/httpdocs/new/system/core/codebreeder/view.php(171): include('...')
#4 /var/www/vhosts/bol-chat.de/httpdocs/new/application/core/view.php(666): CodeBreeder_View::load()
#5 /var/www/vhosts/bol-chat.de/httpdocs/new/templates/matrimonial/header.php(235): View::load()
#6 /var/www/vhosts/bol-chat.de/httpdocs/new/system/core/codebreeder/view.php(171): include('...')
#7 /var/www/vhosts/bol-chat.de/httpdocs/new/application/core/view.php(666): CodeBreeder_View::load()
#8 /var/www/vhosts/bol-chat.de/httpdocs/new/application/views/pictures/view.php(1): View::load()
#9 /var/www/vhosts/bol-chat.de/httpdocs/new/system/core/codebreeder/view.php(171): include('...')
#10 /var/www/vhosts/bol-chat.de/httpdocs/new/application/core/view.php(666): CodeBreeder_View::load()
#11 /var/www/vhosts/bol-chat.de/httpdocs/new/application/controllers/pictures.php(1209): View::load()
#12 /var/www/vhosts/bol-chat.de/httpdocs/new/system/core/codebreeder/codebreeder.php(187): Pictures_Controller->view()
#13 /var/www/vhosts/bol-chat.de/httpdocs/new/system/core/codebreeder/codebreeder.php(82): CodeBreeder_Core::execute()
#14 /var/www/vhosts/bol-chat.de/httpdocs/new/index.php(114): CodeBreeder_Core::initialize()
#15 {main}