Thanks for the reply. I tried changing the user to Nike and it worked fine.
I did a little bit of debugging and found the script seemingly looping over a comment that contained these characters: ?!$&@!? I wonder if the ampersand is causing some code somewhere to treat these characters as an HTML escape character, thus breaking? (Don’t put too much faith into what I say as I only took the briefest of looks.)
In the end I just changed to a different Instagram plugin. Which is not a slight on you or this plugin. It’s just easier and faster for me to fix the problem this way.
Thank you for your prompt help, it was very appreciated.