If you're sure you didn't either install a mod wrong or remove a mod you USED to have installed (which are usually the case here), you might try checking to see if you can load the save in question in the game itself.
If you can, look everything over to see if it has a missing or strange description or name or something. Entries in dialog.tlk are essentially just indexed text strings, so if something in the game is trying to point at 130469 and it isn't available, you should either get some kind of error or at least the data there should look weird.
Personally, I'd suggest looking through every item in inventory (and on all characters) first, since it happens when you attempt to edit your inventory.
You should also double check to make sure there are no stray files in your override folder, particularly UTI files. --Again, those are item files, and since the problem seems to be tied to using the inventory editor, it's as good a place as any to start.
Another thing you might try... Download the KotOR FindRefs utility and get it running. Then enter 130469 as your search term, and choose the "Include TLK file references" radio button and be sure it's set to KotOR (not TSL).
Run a search on all file types, and if any file anywhere is trying to address that StrRef, it should find it. If so, it will list the module and file that's trying to point to it, which can make getting this fixed a whole lot simpler.