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Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '31a9808055ab181432f2154d8c631f65' for key 'PRIMARY'

INSERT INTO sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('31a9808055ab181432f2154d8c631f65', -1, 1571827161, 1571827161, '03d15057', -4, 0, 0)

Line : 226
File : sessions.php