Error: https://prnt.sc/skTla_45kQ_7

Mods 1: https://prnt.sc/Zcvqw6t4me-H
Mods 2: https://prnt.sc/xlHeOtzxkD9D
Mods 3: https://prnt.sc/3qqmTIwqj_iM
Mods 4: https://prnt.sc/KfDrHI6j2_4c
Mods 5: https://prnt.sc/ODqJDS1KOtXz

Unsure about what could lead to errors here

That's a very long list of mods. I'm don't have the time to parse through the images to try figure out which of these mods is causing an issue. If you are able to narrow that down and send it to, I'll be able to work on it.

I'll see, but thanks for the response!

Hey, I will hijack this discussion to provide more details about the issue.

The problem probably appeared after 0.8.4 update that added stacking loaders without space age requirement but now requiring Stack Inserters mod.

I'm running Pyanodons which specifically asked me to disable Space Age DLC in mods which I've had disabled since I started playing it with Space Age executable. It worked fine until I updated Factorio and all the mods today.

I added couple of prints around exception's frame and discovered that somehow I've had the mdrn-enable-stacking setting set to stack-tier, maybe a bad migration or an old setting value that was set to stack-tier but was non-functional with space age mod disabled until the 0.8.4.

After temporarily changing that setting conditional checks to stack-tier2, loading the game, changing the setting to None and reverting the mod files' changes everything started working correctly.

I think the mod should verify whether the stack-inserter really exists instead of crashing if its missing.

Hi, I was also having this problem for some time in my Pyanodons run, and after installing "Stack Inserters" mod, the problem was solved. Thank you.

This should be addressed in the latest version (0.8.7)

Great stuff, thank you so much!