I am playing with other mods, but overall, if I I crate blueprints without having the materials, it just crashes.

[Crash Info]

The mod Quantum Fabrication (2.4.8) caused a non-recoverable error.

Please report this error to the mod author.

Error while running event quantum-fabricator::on_tick (ID 0)
quantum-fabricator/scripts/qs_utils.lua:24: attempt to index field '?' (a nil value)
stack traceback:
quantum-fabricator/scripts/qs_utils.lua:24: in function 'add_to_storage'
quantum-fabricator/scripts/qf_utils.lua:172: in function 'fabricate_recipe'
quantum-fabricator/scripts/builder.lua:45: in function 'instant_fabrication'
quantum-fabricator/scripts/tracking_utils.lua:194: in function <quantum-fabricator/scripts/tracking_utils.lua:190>
(...tail calls...)
flib/table.lua:294: in function 'for_n_of'
quantum-fabricator/scripts/tracking_utils.lua:88: in function 'on_tick_update_requests'
quantum-fabricator/scripts/events.lua:415: in function <quantum-fabricator/scripts/events.lua:413>

Please upload your save somewhere including a blueprint that makes it crash.

Sure, It's usually some items that require Smelting? (Steel, Bricks, Etc)
Still have a feeling that's probably mod incompatibility, since I didn't go testing around much trial and error, so I do apologize.
I set up to have just enough to quicky crash with rails. (Blueprint ready, but you can just copy + paste nearby tracks if needed).
I'd also point out the "brick flooring" used to do it too (Which had pretty much the same error), but currently stopped... for unknown reasons, should I manage to do it again, I'll post it.

[Video]
https://youtu.be/-paj0fKb2O4
[Save File]
https://mega.nz/file/rc5HHb7Q#NgdfiTe369LKIWWpF6TZRKBbiHV7ty_L_GBx84JRrc8

Thanks for the save.

The problem was indeed with a mod incompatibility. Upcycler mod features a recipe that has basically everything as a product, including things like parameters, and it's not marked as hidden, so my mod thinks everything is fine and this is indeed a totally legit recipe to process, it just gives it a lower priority. So once the higher priority recipes are no longer available (when you are run out of resources), it attempts to use this mega-recipe which adds 1 of everything to the storage, and because parameters are banned from it everything crashes.

I've added this recipe to blacklist, it should work fine now.