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 ('4c731051aefcbf2d2ecf7dea780fd45c', -1, 1711704768, 1711704768, '2cde7d72', 3, 0, 0)

Line : 187
File : sessions.php