The variable ** needs to have a non-Blank type.

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Posted on by johnjohnPter

1,837 Season of Giving Solutions 2025

Hi.

I have a canvas application and recently i started to getting this warning on some of my local variables "UpdateContenxt({colSelectedStreetNames:Blank()})":-

The variable colSelectedStreetNames needs to have a non-Blank type. If this is the only place that colSelectedStreetNames is defined, resolve this by adding another definition elsewhere that assigns a non-Blank value to this variable.

as follow:-

so what caused this warning ? and how to solve it? the strange thing, is that the collection is working well.

Thanks

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Farah-F 50 on at

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The warning appears because Power Apps uses static type inference, it looks at all the places a variable is defined to determine its data type. When the only definition it finds is Blank(), it has no type information to work with.

The fix is to add at least one initialization of the variable with a real typed value somewhere in your app (e.g. App OnStart or Screen OnVisible).

Depending on your variable type:

If it holds a simple single-column Table of text:

UpdateContext( { colSelectedStreetNames: Table({Value: ""}) } );

If it holds a Text value:

UpdateContext( { colSelectedStreetNames: "" } );

If it holds a Record:

UpdateContext({colSelectedStreetNames: {StreetName: ""}})

You don't need to remove your existing Blank() reset lines , just make sure there is at least one other definition elsewhere that assigns a typed value. Power Apps only needs one typed reference to infer the variable's type and the warning will disappear.

Hope this helps! 🙂

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Kalathiya 1,502 Super User 2026 Season 1 on at

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Hello @johnjohnPter,

You must initialize the variable with a real value somewhere in your app before using it as Blank(). Currently, the variable is only declared as Blank() and is not used anywhere that's why it's giving this error else. If it isn’t needed, you should simply delete it.

If this response resolves your issue, please mark it as the Verified Answer so it can help other community members as well.

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