I have tried the revision 197 of fab4mazz in the nearbyarrivals trunk.

Sometime, when you re-open the app, at the line 196 of the file ResultListFragment.java, the FloatingActionButton.show() is invoked on a NULL object, causing a crash.

https://bazaar.launchpad.net/~fab4mazz/bus-torino/nearbyarrivals/view/head:/src/it/reyboz/bustorino/fragments/ResultListFragment.java#L196

Imported from

https://bugs.launchpad.net/bus-torino/+bug/1846370