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Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '64c2750e82c25ca506a32c88db64451d' 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 ('64c2750e82c25ca506a32c88db64451d', -1, 1561061723, 1561061723, '36d29ea3', 18, 0, 0)

Line : 226
File : sessions.php