Countdown timer help

[thecdnmole]

I found this code on the internet which works good, except when I want to close the workbook while it is counting down. This is the code and highlighted line is where it breaks. Can someone help with this to allow the timer to stop? Thanks in advance!

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[cory0789]

What exactly are you trying to do with this code?

[thecdnmole]

Thanks cory0789 for the reply, but after tinkering with different code I was able to get it working!