Created attachment 957617 [details]
log

When opening the expression builder with cursor positioned in an existing expression (other than a simple constant or column reference), the following error is logged multiple times:

    java.lang.IllegalArgumentException: Expected argument to be non-null but got null

(relevant part of log attached)

After that, the expression builder behaves in unpredictable way (values do not update etc)


Steps to reproduce:

1. Create a new view table
2. Set the transformation SQL to SELECT concat('a', 'b') AS c1
3. Save the model
4. Place the cursor in the concat expression
5. Click the Expression Builder button