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Power Platform Community / Forums / Power Automate / checking if a string v...
Power Automate
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checking if a string variable is null always return false

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Posted on by johnjohn123 3,514

I have a SharePoint field named "Prime Mover" of type People/Group >> and it is optional, where i have the following actions:-

 

1) Get the display name of the "Prime Mover"

2) Assign it to a variable

3) Check if this variable is null

 

but even if the user did not enter "Prime Mover" value >> condition (check if the variable is null) will evaluate to false, as follow:-

 

johnjohn123_0-1684856484775.png

 

here is the output when the flow runs:-

 

johnjohn123_1-1684856533078.png

 

 

any advice on this please?

 

Thanks

 

Categories:
Building flows
I have the same question (0)
  • Pstork1 Profile Picture
    Pstork1 69,110 Most Valuable Professional on at

    String variables by definition are never null. They may be blank, but they aren't null.  Null means the value doesn't exist.  Blank means there is no value in the string.  Its = ""

  • johnjohn123 Profile Picture
    johnjohn123 3,514 on at

    @Pstork1 so is there an IsBlank() function i can use?

  • Pstork1 Profile Picture
    Pstork1 69,110 Most Valuable Professional on at

    No, there isn't an isblank() function. But you can just leave the right side of the condition empty, instead of adding a Null. That will check to see if its an empty string.

  • johnjohn123 Profile Picture
    johnjohn123 3,514 on at

    @Pstork1 I used Empty() function and set the right side of the condition to "true" .. seems it fixed the issue

  • Pstork1 Profile Picture
    Pstork1 69,110 Most Valuable Professional on at

    That will work as well, but it isn't necessary.  You can just leave it blank.

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