phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO darkdoor_phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin, is_robot) VALUES ('21c3c1c7d7411e3b89042d2c08699362', -1, 1568671505, 1568671505, '23ad2f2b', 2, 0, '0', '0')

Line : 175
File : sessions.php