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 ('847b7e12895946f66ab5bcc70a635f51', -1, 1713498248, 1713498248, '1275b6b3', -4, 0, 0)

Line : 187
File : sessions.php