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 ('b4d7f18bdf5c8c9a1c2602aa47385f42', -1, 1711690766, 1711690766, '2cdc3bec', -4, 0, 0)

Line : 187
File : sessions.php