build finished multiple times

[zuntrax]

build <kevin.build.Build object at 0x7f9064176208> finished multiple times, wtf?

Happened quite a lot when redelivering failed webhooks this morning.

[TheJJ]

When I added the message, the wtf had its purpose: I have no idea why this happens and I had no time to investigate, yet. Basically a build delivers its "i'm finished"-message multiple times although this should not happen.