Application.GetOpenFilename problem

I want Nothing to happen when I press Cancel after running Macro with Application.GetOpenFilename,
Is there a way to do this, because when I press cancel now an error pops up(tries to run macro in that specific workbook)
I just want to enable the cancel button so if I press it nothing happens (Macro stops).
Any Ideas?

Here is my Code:

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This usually takes two lines of code, one to use the GetOpenFilename and another to check if the "variable" got filled in or not. This is how I do it:

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