I think the prior error is due to a combination of the maker's mark, sifrah, and the spring sifrah mod to make sifrah function with the modern UI, all while in the Tinker->Mods UI. While in the Mods UI (not the Build UI), the TinkeringLineData.mode is set to 1, and since TinkeringLineData.modobject is null, the error occurs.

Added masterwork mod to my first item, a musket, selected my mark. Went well.

After adding masterwork mod to my 2nd item, a stun rod, I received an error:

ERROR - no modobject on mod line masterwork

at Qud.UI.TinkeringLineData.get_cost () [0x000a6]
at Qud.UI.TInkeringStatusScreen.HandleHighlightObject(XRL.UI.Framework.FrameworkDataElement data) [0x0001d]
at UnityEngine.Events.InvokableCall`1[T1].Invoke (T1 args0) [0x00000]
[snip]

Afterwards, the Esc menu text was invisible making it difficult to find the save & exit selection to click. See https://media.discordapp.net/attachments/449667247297003520/1321326438892441630/Screenshot_2024-12-24_213303.png?ex=676cd4a4&is=676b8324&hm=94019955dea2f1f64cd36b5f6a982945743811e9487acd8cbe2f6c5e240b8e75&=&format=webp&quality=lossless&width=548&height=397

Clever idea, should be in base game ha.

It's such a simple idea, but it absolutely *rules*. Love the feel this provides. If you can make masterworks, why shouldn't you have your own maker's mark, after all?

I Love this mod so much!!! Now I have a pink heart next to all my cool stuff. It's unexpectedly great for organizing too because it sorts alphabetically. Thank you so much author, this is a masterwork:)