arosien commented on issue #844:
URL: 
https://github.com/apache/daffodil-vscode/issues/844#issuecomment-1885953812

   Ok, I've reproduced this and it doesn't involve the fact that there's a 
schema within a jar file--it's when you are stepping and a subsequent step over 
command ("next") is sent (because maybe you're clicking "step over" quickly) 
while the front end is still requesting data from the previous step. So when a 
prior request for `scopes` happens after the `next` executes, that stack frame 
doesn't exist anymore because you've advanced over it:
   1. R> next
   2. <R next
   3. <E stopped
   4. R> threads
   5. <R threads
   4. R> stackTrace
   5. <R stackTrace
   6. **R> next**
   7. <R next
   8. R> scopes (related to step 1, not step 7)
   
   The code aborts in this condition, but I think it should only emit a warning 
noting that it may be due to rapid stepping from the user, and the updated 
state from the "interrupting" next command should subsequently be requested 
properly.


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