[03-May-2026 10:55:15 Asia/Tehran] PHP Fatal error:  Uncaught TypeError: hash_equals(): Argument #1 ($known_string) must be of type string, null given in /home/larschoo/api.larschool.ir/db/main_db.php:54
Stack trace:
#0 /home/larschoo/api.larschool.ir/db/main_db.php(54): hash_equals()
#1 /home/larschoo/api.larschool.ir/survey/index.php(180): Main_db->validateUser()
#2 {main}
  thrown in /home/larschoo/api.larschool.ir/db/main_db.php on line 54
[03-May-2026 10:55:15 Asia/Tehran] PHP Fatal error:  Uncaught TypeError: hash_equals(): Argument #1 ($known_string) must be of type string, null given in /home/larschoo/api.larschool.ir/db/main_db.php:54
Stack trace:
#0 /home/larschoo/api.larschool.ir/db/main_db.php(54): hash_equals()
#1 /home/larschoo/api.larschool.ir/survey/index.php(180): Main_db->validateUser()
#2 {main}
  thrown in /home/larschoo/api.larschool.ir/db/main_db.php on line 54
[03-May-2026 10:57:16 Asia/Tehran] PHP Fatal error:  Uncaught TypeError: hash_equals(): Argument #1 ($known_string) must be of type string, null given in /home/larschoo/api.larschool.ir/db/main_db.php:54
Stack trace:
#0 /home/larschoo/api.larschool.ir/db/main_db.php(54): hash_equals()
#1 /home/larschoo/api.larschool.ir/survey/index.php(180): Main_db->validateUser()
#2 {main}
  thrown in /home/larschoo/api.larschool.ir/db/main_db.php on line 54
[03-May-2026 10:57:16 Asia/Tehran] PHP Fatal error:  Uncaught TypeError: hash_equals(): Argument #1 ($known_string) must be of type string, null given in /home/larschoo/api.larschool.ir/db/main_db.php:54
Stack trace:
#0 /home/larschoo/api.larschool.ir/db/main_db.php(54): hash_equals()
#1 /home/larschoo/api.larschool.ir/survey/index.php(180): Main_db->validateUser()
#2 {main}
  thrown in /home/larschoo/api.larschool.ir/db/main_db.php on line 54
