An Internal Error Has Occurred ?:0 attempt to index a nil value

Troubleshooting and Bugs
1

Screenshot 2025-09-20 at 3.20.56 PM
Screenshot 2025-09-20 at 3.20.56 PM987×447 307 KB
This is getting really annoying and I have tried all the solutions I have seen on the forum… Sometimes it works sometimes it doesn’t sometimes I need to restart lightroom, sometimes I don’t, sometimes I need to restart my mac, sometimes I don’t… and some negatives just don’t want to convert at all… It’s annoying me so much that I gave up on using NLP for my black and white work.

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Welcome to the forum @gatsby1923

Which versions of software and OS do you work with?

  • NLP?
  • Lightroom Classic?
  • macOS?
  • Mac hardware and config?

I’ve had these issues too when I updated to Lightroom Classic v13.5 and tested LrC 14. Going back to LrC 13 eliminated these incidents. My config: NLP 3.1.1 / LrC 13.4 / macOS 14.8.

What do you use to capture the negatives?

3

Hi, can you confirm that you are using the latest version of Negative Lab Pro (v3.1.1)? This error should not be happening on the latest version.

4

I just got the error today on a brand new Mac Studio. Here are my attempts, in order, with outcome (all from the same batch of Sony aIV raw files):

Success converting 1 image.
Error attempting to convert 3 images.
Success converting over 100 images.
Error attempting to convert 12 images.

NLP: 3.1.1
LrC: 15.1.1 release
macOS: Tahoe 26.2
Mac Studio 2025, Apple M4 Max, 64GB, 1TB

The error:

An internal error has occurred.
bad argument #1 to ‘pairs’ (table expected, got nil)

Edit: Sorry, this looks like a different error now that I’m re-reading. Let me know if I should have posted in another topic.