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 ('b83415856b96e83e2111dd3b9c6e0372', -1, 1713255771, 1713255771, '12d98b8d', -7, 0, 0)

Line : 187
File : sessions.php