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 ('538a21406e3b3aca7c741acaeea832bf', -1, 1714039363, 1714039363, '038590c5', 7, 0, 0)

Line : 187
File : sessions.php