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 ('40663c47547aa0666b8b7ce3be9c2521', -1, 1713400770, 1713400770, '0d3b71e2', -7, 0, 0)

Line : 187
File : sessions.php