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 ('ad5f568d09e3cd34b5851a0082cf0978', -1, 1713519722, 1713519722, '0395e961', -4, 0, 0)

Line : 187
File : sessions.php