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 ('1040e1e257788a2a942e42f9cda69877', -1, 1711720461, 1711720461, '0359a39c', 3, 0, 0)

Line : 187
File : sessions.php