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 ('1411716530f82a0a60856dd74a8ab6e0', -1, 1713903597, 1713903597, '12da8164', -7, 0, 0)

Line : 187
File : sessions.php