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 ('1378a167246906c3d07a32a87e720c9e', -1, 1714158179, 1714158179, '12d96c0b', -7, 0, 0)

Line : 187
File : sessions.php