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 ('c91ae27f3afe6732c2a75c4601fc841b', -1, 1713531994, 1713531994, '12761efd', -9, 0, 0)

Line : 187
File : sessions.php