php 7.0 compatibility problem

According to the PHP Compatibility Checker plugin, SG Optimizer has a problem:

FILE: /home/customer/www/xyz.com/public_html/wp-content/plugins/sg-cachepress/vendor/pear/net_dns2/Net/DNS2/RR/NSAP.php
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FOUND 1 ERROR AFFECTING 1 LINE
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 176 | ERROR | The behaviour of hexadecimal numeric strings was inconsistent prior to PHP 7 and support has been removed in PHP 7. Found: '0x47'
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