Is Batmobile Defy Mini a fake device?

Fabric reports rare crashes which I generally cannot reproduce

Fabric identifies it as Batmobile (manufacturer) Defy Mini (device model) running Android 5.0.2 Motorola has a device named Defy Mini which was introduced in 2012 running Android 2.3.

Other answers report a fake device used to scan for viruses by Trend Micro https://stackoverflow.com/a/34942270/923557

Here is a report of an unreproducible error involving this specific device: https://groups.google.com/forum/#!topic/google-admob-ads-sdk/5KQ2SxazCjg

Can I ignore all crashes where this device is the only affected device?

I received the same user from Sentry. I think you can ignore it. Probably it is a bot scanning your app.