Hello, i just updated to the new 1.0.13 version and got this error:
Error ModManager.cpp:1764: Failed to load mod "molten_plastic": molten_plastic/prototypes/compat.lua:579: attempt to index field 'sulfonated-plastic-production' (a nil value)
stack traceback:
molten_plastic/prototypes/compat.lua:579: in main chunk
[C]: in function 'require'
molten_plastic/data.lua:5: in main chunk

I've test with just Corrundum and MP and got the same error.

Greetings,
Der Failer

Looks like I tested with an old version of corrundum!

The new internal name is just "sulfonated-plastic". Since it was a recent patch with very few downloads, I've removed the faulty version from the mod portal and reuploaded a fixed version of 1.0.13, please redownload the mod.

Thank you for your report!

i confirm this since I got this issue too.

I just updated and it now works fine for me. Make sure you're using the lastest version of corrundum (1.0.43). If you updated Molten plastic before Powerscooter posted here, delete Molten plastic and download it again (since the version number wasn't changed, you cant rely on auto update).

If you don't know where the mod folder is, have a look here. https://wiki.factorio.com/Application_directory

Sorry for the trouble if you're on the old 1.0.13 version. I've elected to just remove the faulty version as it only had a handful of downloads yet.
Alternatively you can also just wait for tomorrows release, which I'll finish tonight.

Fixed in today release, (along with Castra compat) thank you for your patience!