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 ('215c36be6d1a02073d4c4c136b3e8751', -1, 1714005800, 1714005800, '0311b85a', -10, 0, 0)

Line : 187
File : sessions.php