Since I don't know how to get past the wrench in copying a debug, here's an easy recipe to reproduce the error.
1. Open up a fresh image of Cuis, and a fresh browser.
2. Add a dummy category and class.
3. Add a test method to return a string.
3. Add text to the string before accepting it.
4. Repeat 3 or 4 times then an error will appear: 'Instances of UndefinedObject are not indexable'
5. Clicking on the text pane will produce additional errors with the same message.
This appears to be semi-random. I have had it happen without the repeats in step 4.
It sometimes goes away for a while.
In my newbie opinion, it looks like it must happen to people frequently. It also happens in Workspace.
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