P: When trying to add files to Collections I get this error: ?:0: attempt to compare two nil values

*El hoo Please upgrade to 10.1 version.

Has lightroom made any updates to this problem yet? All the posts seem to have been made a month + ago and I am still having the same problem of not being able to add to a collection or the quick collection. It is now December 9. The work around (changing the sort) does not work for me.

I have tried to use this workaround for adding photos to quick collection but keep getting the same nil message. Is there any other workaround?

Thank you.  🙂  It worked for me.  And besides, it was not that troublesome anyway.  LR is a great product.  Keep up the good work.

@John_R_Ellis

Ditto... the workaround worked for me today, too. 

Thanks a ton.  

Thanks John Ellis for the work-around.

Extremely frustrating for this not to be working.   Please fix the bug.

I experienced the same problem, specifically dragging images to  a Gallery in the SmugMug LR  Classic Plugin. It was recommended that the problem could be fixed by going to Library>View>Sort> Ustinov Order, and change the order. For me it did not work, so I eventually deleted the Gallery, a d reloaded it with success. This has occurred twice, and each time the workaround worked.

Where my problem started was when I deleted some images in the Gallery, and subsequently reloaded them after running the Dng images through the DXO PhotoLab V 4. LR Classic Plugin.

Adobe Support told me that this is a known issue that is being worked upon.

I hope this helps.

Adrian T.

I also installed LrC 10 on my MacBook Pro (Retina, Mid 2015, macOS Mojave 10.14.6) a couple of days ago and I get the same error "?:0: attempt to compare two nil values", but on two completely different occasions:

1.  if I want to add an image to my quick collection. Grid sort changing does not help in my case. 

2. if I work on images stored on my NAS (WD My Cloud EX2 Ultra): Here, it is really bad, I get the error all the time if developing my images. 

Did anyone have the same problem when working on an NAS, too? Any help is highly appreciated!