I spent some time creating set lists, with duplicate songs of the same name, reordering, deleting, viewing, and so on but disappointingly I couldn't make it crash even once. 
I tried on the tablet and on the companion (admittedly the companion is a bit glitchy but I think Mike put that down to having to use the built-in Android list thingy).
In fact, the only crash I could get was the one that Mike has now fixed, where you can 'delete a song' but the song list doesn't update so you can still re-add it to the set list, and then when you try to view the set list it will crash because the song doesn't exist anymore.
Asus Transformer Pad TF300 Android 4.1.1 - App version 4.0.1 from Google Play - Companion 1.3.6
I tried on the tablet and on the companion (admittedly the companion is a bit glitchy but I think Mike put that down to having to use the built-in Android list thingy).In fact, the only crash I could get was the one that Mike has now fixed, where you can 'delete a song' but the song list doesn't update so you can still re-add it to the set list, and then when you try to view the set list it will crash because the song doesn't exist anymore.
Asus Transformer Pad TF300 Android 4.1.1 - App version 4.0.1 from Google Play - Companion 1.3.6