The addon has been working well for months, up until a few days ago. While it works on most of my toons, my main Wildstar character can't use it. I'm given a pop-up with this message when I try to preview an item from a vendor, my inventory, etc.:

...r\Addons\itempreviewimproved\ItemPreviewImproved.lua:1242: attempt to index a nil value
stack trace:
...r\Addons\itempreviewimproved\ItemPreviewImproved.lua:1242: in function <...r\Addons\itempreviewimproved\ItemPreviewImproved.lua:845>
[C]: in function 'Event_FireGenericEvent'
ui\ContextMenuItem\ContextMenuItem.lua:109: in function <ui\ContextMenuItem\ContextMenuItem.lua:97>

I'm not certain why it isn't working for this one toon, but for all the others. Thank you!

Which item are you trying to preview?

Any gear/costume items. I can preview decor fine, but anything to do with clothing gives me the previous error pop-up.

hmm, I'm using it myself and I'm not running on any issues whatsoever on any character.
Can you give me a list of the Addons you are using?

Perspective, Killroy, ItemPreviewImproved, SpeedyQT and CharacterShot (these last two are disabled). Perspective is the addon I added most recently, but even then that was a couple of months ago. I never had issues with addons interfering with ItemPreview before. I can't think of anything I might have done differently on my main character than any of my alts.

Using the same addons more or less, so not related probably.
I will see if I can find anything out and let you know.

Thank you very much!

Was happening for me as well, had to comment out a few lines around 1242 that were trying to set my current costume in the preview window to get it working