How do you check for Null in Power Automate Desktop? (versus empty)

[drake]

We need to check to see if a JSON value is null or not.  Here is the JSON:

"customfield_25300": null,

When using the "If" statement, with "Isn't empty", a "variable doesn't have a property" error message is presented (screenshots below).  This error message doesn't appear, however, if customfield_25300 contains a value (e.g. "John") instead of null.  This makes us think that our value in "First operand" is correct, but that the null in the JSON is in some way confusing the "If" statement.

How do you check for null in Power Automate Desktop?

[yoko2020 · Accepted solution]

There is already solution here 

More Samples

Copy and paste to your PAD designer.

SET NewVar TO $'''{\"name\":\"John\", \"age\":30, \"car\":null}'''
Text.Replace Text: NewVar TextToFind: $'''%'null'%''' IsRegEx: False IgnoreCase: False ReplaceWith: $'''%'\"\"'%''' ActivateEscapeSequences: False Result=> NewVar
Variables.ConvertJsonToCustomObject Json: NewVar CustomObject=> JsonAsCustomObject
IF IsEmpty(JsonAsCustomObject['car']) THEN
    Display.ShowMessage Icon: Display.Icon.None Buttons: Display.Buttons.OK DefaultButton: Display.DefaultButton.Button1 IsTopMost: False ButtonPressed=> ButtonPressed3
END

[takanee]

@drake 
This could be a solution.

• Add In/Out Variable with 'Empty'
  • Not "Set Variabes"

usage example

Power Automate Desktop: null を利用する方法 - Qiita