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 ('3ef6ba360c790d4b34e4b64fc047c15e', -1, 1711694709, 1711694709, '3658b30c', -9, 0, 0)

Line : 187
File : sessions.php