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 ('7456f0e0b45e5d836a77915a07373c0f', -1, 1711621708, 1711621708, '2ccd0541', 2, 0, 0)

Line : 187
File : sessions.php