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 ('0fa7908b2af479dc3a19b0f419073387', -1, 1713946855, 1713946855, '0315613d', -7, 0, 0)

Line : 187
File : sessions.php