KnownReaction causes "502 Gateway error"

[srcr]

Since a while I had issues on my home Known instance i regular update from git to get the latest code.
Since a few week when I clicked to a post to see comments etc I would get with in a second a "502 Gateway error" from my nginx server. Troubleshooting wasn't easy and I don't have a clear error message.

Only think I did today is remove KnownReactions as plugin and everything works again as expected.

I realize it is not much to go on but if you need anything from my end let me know.