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 ('36ef4e6dc5d57e2a630b80a3aa5dfbeb', -1, 1711713420, 1711713420, '2cd267e9', -11, 0, 0)

Line : 187
File : sessions.php