Fatal error: Uncaught exception 'TypeError' with message array_key_exists(): Argument #2 ($array) must be of type array, null given
Stack trace:

#0 /home/vhosts/sis/archive/2017/12/inc/blocks.php(156): set_default_value(NULL, 'info', '')
#1 /home/vhosts/sis/archive/2017/12/inc/pages.php(39): TeachersBlock->__construct(Array)
#2 /home/vhosts/sis/archive/2017/12/C/index.php(156): ParallelPage->__construct(Array)
#3 {main}

thrown in /home/vhosts/sis/archive/2017/12/inc/common.php on line 57