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 ('17ca5a7d81eb968a55436710d2f5a25f', -1, 1711719555, 1711719555, '2cde5c86', -11, 0, 0)

Line : 187
File : sessions.php