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 ('426e4264def7c9cd12f7811dfbe0800a', -1, 1711615375, 1711615375, '36929af3', -1, 0, 0)

Line : 187
File : sessions.php