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 ('4eea9bb500be1efde8c4f37d9a1ef85f', -1, 1709647047, 1709647047, '2cdc3eb7', -1, 0, 0)

Line : 187
File : sessions.php