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 ('c55a41b258b27c32b98e3bd64a2d8bf1', -1, 1714029509, 1714029509, '12767ef1', 7, 0, 0)

Line : 187
File : sessions.php