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 ('b60a9da7c7bb9ca5e2acd3a787a40d1b', -1, 1711619868, 1711619868, '03511e29', 7, 0, 0)

Line : 187
File : sessions.php