Remove bug from android studio web view app

I have a web view app that works well on my site. The only problem is that my website has a WhatsApp button. The website is written in Laravel. When the user clicks the WhatsApp button in the android web view, Whatsapp opens perfectly in the official Whatsapp application. But my web view app turns to a blank screen. Users need to restart the app in order to work with the app. If you know how to work with web view, Then only bid on this project.