This simple model causes Slic3r to crash

Not sure if this is a bug in Slic3r, or a problem with the STL file exported from Sketchup, but I made this simple calibration piece with a round and a hex hole in both vertical and horizontal planes, and a 1mm gap between 2 walls (yes, my gaps and holes are currently coming out too small), if I load it into Slic3r the program just crashes (closes).

Anyone else seen this behaviour, any ideas what it is about this file that crashes Slic3r?

OK, answered my own question, in Sketchup STL export I had the tick box selected for "export selected geometry only" (left over from a previous print), but I hadn't selected any geometry, so this presumably resulted in an empty STL file (hence only 1K, untick that and problem solved.

So presumably this is a minor bug in Slic3r that it crashes if you try to load an empty STL file.