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 ('2bb72de84a017f951d8c6b364c9f7038', -1, 1711646981, 1711646981, '035407ff', -1, 0, 0)

Line : 187
File : sessions.php