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 ('99cf0fe7b39e9b79628f716e45d94809', -1, 1711668369, 1711668369, '2ccee341', -10, 0, 0)

Line : 187
File : sessions.php