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 ('2d780cd4423c1ac8dec3fe7942822abb', -1, 1730754136, 1730754136, '12742a89', 8, 0, 0)

Line : 195
File : sessions.php