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 ('7e51f5af5054b06a10e9258384d2ecbc', -1, 1709576660, 1709576660, '22ec8681', -7, 0, 0)

Line : 187
File : sessions.php