phpBB : Critical Error

Error creating new session

DEBUG MODE

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

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('3fb2594fc838137208fad294ee8b8799', -1, 1711707507, 1711707507, '12ea9ac5', 2, 0, 0)

Line : 187
File : sessions.php