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 ('b73c03af3e2cdb0f5b7943e6623f7ed8', -1, 1711628665, 1711628665, '2ccd0541', -4, 0, 0)

Line : 187
File : sessions.php