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 ('3a7b611c7721a3c71738d28d488c3f16', -1, 1713900127, 1713900127, '038cf2a5', -8, 0, 0)

Line : 187
File : sessions.php