Internal Error Attempt to Index a Null Value

[Ted_Mikalsen]

I have LR 5 and am trying to upload a collection to a SmugMug gallery.  I have done this previously with no problems, but encountered the following message on my latest attempt:?: attempt to index a null value".  The Adobe LR site is of no help and I can't find access to trouble-shooting explanations.  Does anyone have any idea what this means and how to solve the problem?

Thanks, Ted Mikalsen

[Moved from non-technical Forum Lounge to specific Program forum... Mod]
[Here is the list of all Adobe forums... https://forums.adobe.com/welcome]

[JP Hess · Accepted solution]

If you are using the standard export dialog, make sure you have selected "Do nothing"  in the postprocessing section.