Hey,

I love your mod (MODS) I use a few of what you made, It seems that one of the mods i'm running is causing a crash with the Robots trying to upgrade the yellow belts in the as I call it Upside down World

Not really sure how to post pictures.

https://ibb.co/LnSGwdV

You mention upgrading. Are you using Upgrade Planner?

Yes (I'm not sure however the mod that makes the bots auto upgrade the belts)

Just Confirmed its not Upgrade Planner causing the crash. I uninstalled and loaded the save still crashed!

** Likely due to a mod called Belt Upgrader haha! Sorry for bugging you I'll try without it. Merry Christmas hope all is well for you and family!

Nope not that one either.. weird!

When you get a chance, please outline exactly what it is you’re trying to do, e.g.:

1. Start with yellow belts underground.
2. Get an Upgrade Planner item from the Upgrade Planner mod.
3. Add a setting in the Upgrade Planner changing from yellow belt to red belt.
4. While standing on the surface and with the Upgrade Planner in hand, shift-drag-select an area containing yellow beltlayer connectors and underground yellow belts.

Etc.

It’s also possible your save is corrupted from another mod. If possible, start a new map in Sandbox mode and see if you can reproduce the crash. You can try uploading the save somewhere and I’ll try taking a look at it.