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TypeError "Cannot set properties of null (setting 'firstPageNumber')" Power Apps

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Posted on by tasyaaa

Hi everyone,

I’m encountering a TypeError: Cannot set properties of null (setting 'firstPageNumber') error every time I submit a form.

Initially, I used the SubmitForm function, but I switched to Patch to update the data. However, the error persists.

The button’s OnSelect formula looks something like this:

the data is updated everytime the button is clicked but , the error still shows up.

I’d appreciate any insights on why this might be happening or how to debug it.

Thank you in advance for your help!

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Error handling

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WarrenBelz 153,084 Most Valuable Professional on at

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Hi @tasyaaa

Can you please remember to post your code in Text - saves re-typing here. The code below is OCR'd so watch spelling.

Firstly, do you have a field called firstPageNumber in the list and is it required ?

Also, why are you setting all those "one use" Global Variables instead of referring directly to the control output (examples highlighted below).

Lastly what type of field is Customer ?

If( StatusBefore = "Requested" && SS_CurrentShipStatus = "Shipped", UpdateContext( { deleteMode: true, varShowUpdate: false } ), Patch( 'SampleShipment-OSF', { ID: ShipmentSampleData.Selected.ID, Product: SS_NameCode, BatchNumber: SS_Batch, Quantity: SS_Qty, ShipmentStatus: DataCardValue44.Selected.Value, ShipToCustomerDate: DataCardValue20.SelectedDate, FeedbackStatus: SS_FeedbackStat, UpdateDescription: DataCardValue44.Text, CustomerTestimony: SS_CTestimony, ProductNameCode:SS_NameCode2, Customer: DataCardValue21.Selected, Country: SSCountry } ); UpdateContext( { varShowUpdate: false, varReflow: 'PowerAppsOneGrid.ReflowBehavior'.Reflow } ) );

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WarrenBelz 153,084 Most Valuable Professional on at

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tasyaaa 63 on at

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Hi @WarrenBelz, I don’t have any fields called firstPageNumber. I set the variable because it will be used on another page. If StatusBefore = "Requested" and SS_CurrentShipStatus = "Shipped", it will open another confirmation page. On that page, there’s a button that performs a patch with the data I set.
Additionally, Customer is a lookup value to another table.

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WarrenBelz 153,084 Most Valuable Professional on at

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OK - it is making very little sense if you do not have a field with that name as the error seems to be saying it is required. You can also refer to controls on another screen. So back to the debugging exercise, that is the Item and DataSource of the Form and what happens if you submit it directly (using SubmitForm) from the same screen ? Are you also saying the code works in the Patch, but produces an error on the screen ?

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tasyaaa 63 on at

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Hi @WarrenBelz,
I think the issue is not related to the Patch or SubmitForm functions, as both run correctly.

After I click the button that includes the Patch function, it navigates to a page with a table component.

I just discovered that firstPageNumber is a pagination property in Power Apps. https://learn.microsoft.com/en-us/power-apps/developer/component-framework/reference/paging

I didn’t manage the pagination manually; I’m using the built-in table properties from Power Apps, which handle pagination automatically.

I’m wondering how I can access the underlying code to modify it.

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WarrenBelz 153,084 Most Valuable Professional on at

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OK - that seems to be something new I must admit I have not used. So the issue is nothing to do with the code posted, but probably the Items of a gallery on a page you are navigating to ?

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tasyaaa 63 on at

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@WarrenBelz Yes, actually i use table component it has a pagination feature that is auto-configured by Power Apps.

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WarrenBelz 153,084 Most Valuable Professional on at

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I think you need to re-look at your component - not much I can do to assist here. If this is a Modern control, you might consider reverting to a Classic version.

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tasyaaa 63 on at

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Update : The Bug Disappear by itself

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