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 ('ed3723e9f9a9876472194f69b1bfdeec', -1, 1713957169, 1713957169, '0390ac73', -4, 0, 0)

Line : 187
File : sessions.php