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 ('9f905fd1070ef231de4d4795dce5c4ce', -1, 1711617851, 1711617851, '035081c3', 3, 0, 0)

Line : 187
File : sessions.php