Offline Forms extension – Contact Form 7

Hello, I’m using Offline Forms extension and have a problem with sending Contact Form 7 submissions when offline. I added app to iPad and form is working good when online, but when I’m offline, I click submit button and get this error: “Safari cannot open the page. The error was: FetchEvent.respondWith received an error: ReferenceError: Can’t find variable: OFFLINE_URL”. Extension has no settings so not sure what can I do. Not sure if this is plugin issue or something on my side. Please help. Thanks!