Rev Slider not working on iPhone.

Rev Slider not working on iPhone. Getting the following error on a few devices it is a white screen.

https://cdn.livechat-static.com/api/file/lc/att/8801096/d9a5c572cd78370d4b010952c9ac6384/81616312_2562141260725521_4328524408059592704_n.jpg

Please check and help.