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 ('64b046e99e617c9cb1a15a939f0ffc57', -1, 1711703096, 1711703096, '345a83c8', -10, 0, 0)

Line : 187
File : sessions.php