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 ('10be9077b7bc7b968f052093ee3369da', -1, 1711724916, 1711724916, '2cde7af6', -4, 0, 0)

Line : 187
File : sessions.php