I am not sure if this is a old bug you are aware of (have not played the game for months)
but up on loading the game (with all the mods updated) i am getting the following error

https://imgur.com/qgeUS4j

Hm, do you have any mods that might affect the fluid storage tank? Either a big mod like bobs mods or krastorio, or a smaller mod like Optera's fluid tanks?

The only mods that i recall that has storage tanks are the full bob's and angels pack and this mod
https://mods.factorio.com/mod/StorageTank2

Sorry for the late response. It seems to be a compatibility error between bobs mods and Optera's storage tank mk2. I think bobs mods changes the tanks into pipes, while Optera's storage tanks is still expecting them to be tanks, or something like that.

I'll look into this when I can, but I recommend disabling storage tank mk2 mod if you're using bobs mods. I'm pretty sure bobs adds many higher tiers of storage tanks, so you shouldn't need Optera's version.

Thanks the game is loading again