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 ('b2864887cf1ca7cbddc9f94b0fef3edd', -1, 1713963815, 1713963815, '12dc6af1', 2, 0, 0)

Line : 187
File : sessions.php