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 ('18e5bdefc39ded4c32cd813c5a9b0888', -1, 1711699319, 1711699319, '03ee54d5', -4, 0, 0)

Line : 187
File : sessions.php