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 ('8ef8d6bd05fbe3eb37fcc635b084d4ad', -1, 1711726196, 1711726196, '03ed0501', 3, 0, 0)

Line : 187
File : sessions.php