If you disable orecrushing in the startup options of Crushing Industry you get this error.
I know it defeats the purpose of this mod to disable that option, but it's part of a modpack and I didnt want want to go through the trouble of removing required mods, disabling that option seemed like the simplest solution, it would be great if the mod handled the missing ore-crushing gracefully.

Failed to load mods: ...roductivity-research__/prototypes/content/technology.lua:1: attempt to index field 'ore-crushing' (a nil value)
stack traceback:
...roductivity-research__/prototypes/content/technology.lua:1: in main chunk
[C]: in function 'require'
...stry-productivity-research__/prototypes/content/data.lua:1: in main chunk
[C]: in function 'require'
crushing-industry-productivity-research/data.lua:1: in main chunk

Mods to be disabled:
• crushing-industry-productivity-research (1.0.3)

Hm. I'm not happy with that. My intention was to force ore crushing to "on" and hide the setting. I forgot to hide it. I don't really want to offer a "disable this mod" setting just because there is a modpack that forces you to install it. I'd rather like to tell you to not use the modpack if you don't like all parts of it.

It's Stellar Horizons isn't it? You could disable the modpack after you started a game and disable whatever mod you don't like. The only downside is not getting newly added mods automatically.

I fixed the part where it can crash by removing the option to disable ore crushing. Sorry, but your user name applies here :-)