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 ('649937d9ac94bd1d2b2b9fa44148ed0e', -1, 1711719791, 1711719791, '03ec937a', -9, 0, 0)

Line : 187
File : sessions.php