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Passing parameter that can be Empty to Flow

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Posted on by blabla70

Hello,

My PowerApps is passing the 5 string parameters to PAutomate flow. There are 4 mandatory parameters and one optional parameter ("Crit2"), that is sometimes null - originaly empty in the datasource list. The App fails if this parametr is empty. As a workaround, I have set a null value on "-" , but would need a better solution.
Is there a clean way to manage this?

Thanks in advance

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Building Power Apps

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BCBuizer 22,505 Super User 2025 Season 2 on at

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Hi @blabla70 ,

Is it the App or the Flow that's failing when then the parameter is blank?

If it's tha flow probably you have a better chance of getting a solution by posting it in the Power Automate Community: https://powerusers.microsoft.com/t5/Microsoft-Power-Automate/ct-p/MPACommunity

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blabla70 on at

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The app is failing, so I think I am in the right community here 🙂

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NandiniBhagya20 4,667 Super User 2024 Season 1 on at

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Hi @blabla70 ,
The flow/app shouldn't fail if we pass blank value to the flow (If you will not pass any parameter, the app will fail as flow expects one parameter at that time). Please refer below screenshot:

The flow will fail if you are using this blank value in get item action but this can be handled with if condition inside the flow.

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blabla70 on at

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How to condition it inside flow, can pls you elaborate?

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NandiniBhagya20 4,667 Super User 2024 Season 1 on at

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Hi @blabla70 ,
You can use length function inside expression to check if length is 0 or not. If it is 0 that means it is blank.

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blabla70 on at

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at this point the app crashed already

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NandiniBhagya20 4,667 Super User 2024 Season 1 on at

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Hi @blabla70 ,
Try using Coalesce function for the parameter which will be blank in some cases (make sure to add space between double quotes) -
TestBlank.Run(Coalesce(TextInput3.Text," "))

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BCBuizer 22,505 Super User 2025 Season 2 on at

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Hi @blabla70 ,

Can you please share the formula you are using to run the flow?

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