Can you help me debug a dashboard crash?

Hi all,
please see the attached sensu-dashboard.log. Sensu was running all fine when I lost connectivity to the dashboard. A simple restart solved the problem but now I get this dump in my logs that ends with:
You may have encountered a bug in the Ruby interpreter or extension libraries.
Bug reports are welcome.
For details:

The problem is that I currently do not have the time to do a full analysis. So my question is the following:
Have I really encountered a bug in the Ruby interpreter? If yes, can someone help me file a good problem report for this one?
Although being paranoid, I have ruled out the possibility of an attack that caused the segfault.
I am attaching the crash report log. ( I couldn’t find a core file)

sensu-dashboard.log.1 (94.5 KB)