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 ('31b986e28fcec3564d57644dd5e0d2c2', -1, 1711697466, 1711697466, '345a7911', -2, 0, 0)

Line : 187
File : sessions.php