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The changes to silo-script broke on_event in it. Which is used by the Hotpatch mod (mostly because the embedded freeplay code is outdated in it).

The script_events were moved to silo_script.events, but silo_script.on_event still references script_events See
https://github.com/wube/factorio-data/c ... 7f5e0eR316

Thanks for the report,

We don't use that function in the base game now, so I didn't see it

I would suggest to move away from using it in your script, and use the generic event handler I added for these libs

But nevertheless, I have fixed it for the next release