How to stop error when I cancel the input file source command?

If batteryFilename <> "False.xlsx" Then
     Set batteryWorkbook = Application.Workbooks.Open(batteryFilename)
Else
     'USER CLICKED CANCEL
End If

Thanks for the speedy reply.

The error remains unfortunately. I am rather new in the VBA world so I posted my code again with your suggestion to make sure I am not making a rookie mistake.

Sub CommandButton1_Click()

Dim batteryBook As Workbook
Dim filter As String
Dim caption As String
Dim batteryFilename As String
Dim batteryWorkbook As Workbook
Dim targetWorkbook As Workbook

Set targetWorkbook = Application.ActiveWorkbook


filter = "Text files (*.csv),*.csv"
caption = "Please Select an input file "
batteryFilename = Application.GetOpenFilename(filter, , caption)



If batteryFilename <> "False.xlsx" Then
Set batteryWorkbook = Application.Workbooks.Open(batteryFilename)
Else
     'USER CLIKCED CANCEL
End If

Dim targetSheet As Worksheet
Set targetSheet = targetWorkbook.Worksheets(1)
Dim sourceSheet As Worksheet
Set sourceSheet = batteryWorkbook.Worksheets(1)

targetSheet.Range("A1").Value = sourceSheet.Range("B1").Value   'Will be adding more ranges..


batteryWorkbook.Close

End Sub

My apologies... change "False.xlsx" to just "False"

I just tried the

If batteryFilename <> "False" Then Exit Sub
Set batteryWorkbook = Application.Workbooks.Open(batteryFilename)

But that creates a 1004 error again.

No apology needed.
I changed it to "False" but I now am getting a Run-time error '91' Object variable or With block variable not set

That did it!!

If batteryFilename = "False" Then Exit Sub

Thanks everyone for your input.

Take care.