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 ('4421d0c4afc37b7a3f7948d8415090a3', -1, 1713916168, 1713916168, '031042ce', -2, 0, 0)

Line : 187
File : sessions.php