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 ('d6e73805a72b619b74a7d6e7c439eabe', -1, 1714620150, 1714620150, '03865a2c', 8, 0, 0)

Line : 187
File : sessions.php