A problem with lire

iOS and iPadOS

I use lire and I find this app really nice. I use it on my iPhone 5s with the recent iOS installed and also on an iPod Touch 5g which can’t have the 10 version. Instead, I use lire on this iPod with iOS 9.3.5. Recently I’ve noticed that the app crashes on this device even if the previous version of lire is installed. When I hit on lire it starte opening, is on the task bar but does not open. I’ve written to the developper but I didn’t get any answer. Before that, I removed the app and installed it again but nothing has changed. Any ideas apart from changing the device will be appreciated.
Thank you.