Getting file name "False.xlsm" when I click 'Cancel' on the 'Save as' window

Hi, guys. I am facing a problem and I need some help, please.

I have a workbook with a macro that prompts the user to enter a value in D1 and when he does it, a 'Save as' window automatically appears to save the file as a new one. That part works fine. The problem is when the user clicks the 'Cancel' button, it still saves a file named 'False' in the selected directory.

How do I avoid this?

This is the piece of code to save the workbook as a new one:

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Thank you so much.