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 ('bd6a6335c6d6a85e69a0206a1656c0de', -1, 1714024638, 1714024638, '12de7dab', -7, 0, 0)

Line : 187
File : sessions.php