PHP Compatibility Issue

PHP Compatibility Checker plugin reports 2 errors, could you guys fix it?
Maybe only few users are affected by this, but we would appreciate that very much.

FILE: /home/demo/public_html/demo/wp-content/plugins/wp-hotel-booking/includes/wphb-functions.php
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FOUND 1 ERROR AFFECTING 1 LINE
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1392 | ERROR | Only variables can be passed to empty() prior to PHP 5.5.
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FILE: /home/demo/public_html/demo/wp-content/plugins/wp-hotel-booking/includes/shortcodes/class-wphb-shortcode-hotel-booking-mini-cart.php
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FOUND 1 ERROR AFFECTING 1 LINE
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25 | ERROR | Only variables can be passed to empty() prior to PHP 5.5.
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• This topic was modified 6 years, 7 months ago by newbii.
• This topic was modified 6 years, 7 months ago by newbii.