Title: LF_ReducedResearch hard-locks during data-final-fixes pass when executing ingredient scaling on a malformed technology nodeCrash Trace:textError while processing data-final-fixes phase.
Target: ROOT.technology.tree-seeding
Modifications: LF_ReducedResearch (0.2.0)

Description:The mod executes a global post-processing override loop during the data-final-fixes phase to scale down and balance research pack requirements across all active technologies in the game database.During this iteration cascade, the script hits the malformed "tree-seeding" technology node, which was left broken after bio-oil deleted its root "carbon-fiber" prerequisite pointer. Because the script attempts to read and adjust ingredient properties on a technology branch containing an invalid index, the cost-scaling formula hits a fatal pointer error. Please update the master post-processing routine to gracefully skip or handle malformed technology rows during the final data pass.

I have over 100 mods in my mod list and never had this issue, tell me the mod/ mods that cause this issue and I will patch it

"I am actually running a massive modpack with over 220 mods, including Space Age, Bob's, Angel's, and Omni mods.Have you checked their latest updates? Their post-processing routines drastically restructure the technology trees, dynamically shifting and removing nodes. This leaves behind dead prerequisite strings that cause your mod's scaling loop to hit a fatal null pointer." good luck and sorry for not respond faster

Can't be space age and bob's .
Might be Angel's / Omni
I don't use these
I will try to give the mod a few redundancies

hi am back to you mod crahs wityh tihs : Error in assignID: technology with name 'carbon-fiber' does not exist. It was removed by bio-oil.

Source: cloning-vat-technology (technology).

and this is the lsit xd

Bio-oil
Cloning vat building
omnimatter energy
reduced reserch :(

This crash is not caused by LF_ReducedResearch.
The error assignID: technology with name 'carbon-fiber' does not exist happens before any mod's data-final-fixes code runs — your mod list appears in the crash report because Factorio lists all active mods, not because one of them caused it.
The actual conflict is between Bio-oil (which deletes the carbon-fiber technology) and Cloning Vat Building (which still lists carbon-fiber as a prerequisite). These two mods are incompatible with each other in your current versions. You would need to either:

Remove one of them, or
Check if there's an updated version of Cloning Vat Building that handles Bio-oil compatibility, or
Report the issue to the Cloning Vat Building author, since their mod should guard its prerequisites against deletion by other mods.