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Expression.Error: The index cannot be negative.

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Hi all,

 

I can't get my head around this error in my query:

 

Sininen_0-1714027406631.png

I would have expected the negative index to refer to a missing value but I have re-entered all column names in case of any cheeky spaces or capitalisation differences, to no avail. Am I missing something obvious? The funny thing is that nothing should have changed since the last time this query was run and I can't really understand why this would suddenly pop up.

 

Any advice would be greatly appreciated!

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