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 ('3ff31067f69301a66075a71e6c018c5a', -1, 1713535872, 1713535872, '12bc2cdf', -9, 0, 0)

Line : 187
File : sessions.php