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Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '7b9d21d5c579b6af4b97ce068292ca06' for key 'PRIMARY'

INSERT INTO sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('7b9d21d5c579b6af4b97ce068292ca06', -1, 1550524080, 1550524080, '3417c05c', 47, 0, 0)

Line : 226
File : sessions.php