Crash when refreshing ROM list

I right-click on the NES icon and choose Refresh. Then, it asks me if I want to create a new list, and I click OK. Then it crashes.

From running it on the command line, I get this 
```
(gelide:23469): glibmm-ERROR **: 
unhandled exception (type std::exception) in signal handler:
what: std::bad_alloc

Trace/breakpoint trap
```