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 ('2897e69c7517b23024e373bf4be101d5', -1, 1713568496, 1713568496, '0387d1f9', -4, 0, 0)

Line : 187
File : sessions.php