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 ('f7e47eb0a15cf0d788ed04d3ef7b8d1d', -1, 1714025591, 1714025591, '0315e7f5', 2, 0, 0)

Line : 187
File : sessions.php