Error on plugin

Hi,

I had been checking the logs and i saw that the plugin gives a mistake: “Notice: Undefined property: WP_Locale::$is_rtl in /usr/home/MYWEB.ORG/web/wp-content/plugins/event-geek/core/gg-scripts.php on line 96”

What’s wrong? what should i do?

Thanks

https://ww.wp.xz.cn/plugins/event-geek/