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 ('d8ce4f2b9c1d1b64eea5a3fcfa039a13', -1, 1711657690, 1711657690, '2ccc1852', 2, 0, 0)

Line : 187
File : sessions.php