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 ('8ff8b7f6b59f4491acc3b54dea3e64ef', -1, 1709269866, 1709269866, '03ef0997', 0, 0, 0)

Line : 187
File : sessions.php