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 ('5ac76ffa61c68c55b215b4f84aa3bfdb', -1, 1714122279, 1714122279, '1276a497', -4, 0, 0)

Line : 187
File : sessions.php