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I use a query builder to show filtered data in a grid. If I add a rule with In-operator and a selected empty value, then the data is not filtered by the empty value. If I add another value to the rule, then an exceptions appears in the browser console.
Here's a simple example
https://codesandbox.io/s/eager-glade-hw4f4?file=/index.html
You just have to select the column "account", the in-operator and as value the empty value and another one