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 ('47dd03244e84c8a828720dd4b35b04e6', -1, 1711632465, 1711632465, '23ab16dc', -4, 0, 0)

Line : 187
File : sessions.php