Bors falsely reports build failed

Bors reports build failed when it actually did not. This has been happening to us for a couple of weeks now at least. Typically in the dashboard there will be a crash from a few runs prior, no clue if this is related. Here is an example of some crash output.

I do not actually know what else would be useful to write in this question.

 {:gen_server, :call,
    {:checkout, #Reference<0.731403982.753401857.7659>,
     true, 15000},