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 ('ec139a2e44131516a8d210d532e03fc4', -1, 1711699740, 1711699740, '36c6c880', -10, 0, 0)

Line : 187
File : sessions.php