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 ('85a1b914401195a6c47415c31c777ebd', -1, 1714615500, 1714615500, '12df1439', -50, 0, 0)

Line : 187
File : sessions.php