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 ('9e7d43b70c45437b6887c6db0c456a0f', -1, 1713902646, 1713902646, '1275b796', -4, 0, 0)

Line : 187
File : sessions.php