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 ('22c8aa0351ad91dd926d2589408cc714', -1, 1711639695, 1711639695, '2cc8c472', -4, 0, 0)

Line : 187
File : sessions.php