"Merge PDF Files" Acton - Error Object reference not set to an instance of an object.

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Posted on by Sanket1

357

Hi Team,

I am getting this while merging 3 files.
why I am gettig this error while merging?
I have read other forum about same but not get the proper solution.

Thnaks in advance.
"Merge PDF Files" Acton - Error Object reference not set to an instance of an object.

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Power Automate Desktop

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VishnuReddy1997 2,666 Super User 2026 Season 1 on at

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Hi @Sanket1 ,

I think the Problem is with the file path.Make sure that the file paths provided in the “Merge PDF Files” action are correct and the files exist at those locations.
If Possible share the screenshot of the flow.

(Note:- if you got your solution you can mark as solution and gives kudos)

Thanks & Regards
Vishnu Reddy

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Sanket1 357 on at

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Sanket1 357 on at

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Now I am printing the values does it empty before passing to merge pdf action but
My variable contain values of file path still it throwing error

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eetuRobo 4,579 Super User 2026 Season 1 on at

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Try without quotation marks/apostrophes around the variables and square brackets around the variables in Merge pdf files -action

Like so:

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Sanket1 357 on at

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Its throwing error for var_Part_AFile variable
When I tried after skipping the above variable its work.
This variable also return the correct file path by CurrentItem variable ( Current_PartA_File).
Why its throwing error.

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eetuRobo 4,579 Super User 2026 Season 1 on at

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Can you show the error and what value the var_Part_AFile -variable has in it when the error happens(you can draw over the actual filepath text but just to see that its a correct filepath)?

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Sanket1 357 on at

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Correlation Id: 9b3f25de-b346-493a-b2e6-00831b23bf82
Object reference not set to an instance of an object.: Microsoft.PowerPlatform.PowerAutomate.Desktop.Actions.SDK.ActionException: Failed to merge PDF files: 'C:\Users\sanket.shinde\Downloads\Er\PAN_Annexure\GJRBC4059Z_Annexure_2024-25.pdf', 'C:\Users\sanket.shinde\Downloads\Er\PAN_Part_B\GJRBC4059Z_PartB_2024-25.pdf', 'C:\Users\sanket.shinde\Downloads\Er\PAN_Part_A\GJRBC4059Z_PartA_2024-25.pdf' ---> System.NullReferenceException: Object reference not set to an instance of an object.
at Microsoft.Flow.RPA.Desktop.Modules.PDF.Actions.PDFium.PDFium.FPDF_SaveAsCopy(IntPtr doc, FPDF_FILEWRITE writer, Int32 flags)
at Microsoft.Flow.RPA.Desktop.Modules.PDF.Actions.MergePDFFilesAction.Execute(ActionContext context)
--- End of inner exception stack trace ---
at Microsoft.Flow.RPA.Desktop.Modules.PDF.Actions.MergePDFFilesAction.Execute(ActionContext context)
at Microsoft.Flow.RPA.Desktop.Robin.Engine.Execution.ActionRunner.Run(IActionStatement statement, Dictionary`2 inputArguments, Dictionary`2 outputArguments)

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eetuRobo 4,579 Super User 2026 Season 1 on at

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I meant the variable value that you said was giving error. Like so:

Does your Merge PDF files -actions PDF files field look something like this(with different variable names):
So just precent signs and square brackets around all the variables and variables only separated by commas (not quotation marks).

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Sanket1 357 on at

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I have tried this expression ,
it throws error for me, pdf files must be list of files

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eetuRobo 4,579 Super User 2026 Season 1 on at

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Then your variables probably have wrong values.
Can you share screenshots of your variables and their values. Especially the var_AnnexureFile -variable.
Like this:

Are they actually filepaths? It should work like this:

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