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 ('88a70c28e0ae9e3b92804a7cfa2e7352', -1, 1714037431, 1714037431, '1276c856', 4, 0, 0)

Line : 187
File : sessions.php