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 ('b86e0a89b6e53214f7caa2706892ce86', -1, 1711617518, 1711617518, '03ee3909', -11, 0, 0)

Line : 187
File : sessions.php