This error appears a few seconds after loading, when bitumen seep is depleted. Upd.: If I understand correctly, global.oil_derricks is an empty table for whatever reason (I currently have only one derrick on map. I've used one before and it converted to an oil patch successfully, then I removed it a...

Same bug, for bitumen seep.

stdlib's Technology:remove_prereq nullifies prerequisites value of Technology if there's no values left in it.
This could possibly break boblibrary's bobmods.lib.tech.replace_prerequisite, as it has no check for nil value. I'm not sure whose bug this is, but I'm reported to both of you.

I didn't said it's required dependency, it's optional, but it's there. I'm writing custom script loader and this mod fails because pyhightech is loaded, but because there's no dependency, my code tries to load pypetroleumhandling before pyhightech (sadly, I can't completely copy factorio mod loading...

This mod has undeclared dependency on pY High Tech, in data.lua:188-195.
You should add optional dependency in info.json.

Shame on me. It actually was an electricity - though not completely drained, energy satisfaction was close to zero. I should've checked more carefully before creating this post, I'm sorry.

Suddenly every furnace, factory and inserter stopped working, animations too, even though I have electricity, fuel, ingredients. Also, it's obviously some king of bug, because some inserters stopped mid-air with items held. Can't say exactly when it happened, but restarting the game won't help. I ca...