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 ('1fdc1b11b0239ee3e45322af0f5e646c', -1, 1711709279, 1711709279, '12e8233e', -7, 0, 0)

Line : 187
File : sessions.php