Error 91: Object variable or With block variable not set

Dear friends,

I get a message from someone who performs a test for me that message above emerges when opening my vba project. Below is the code. I'm puzzling, but can't find the solution. In my excel 2007 and 2013, the error doesnt appear. Is there anyone who can help me?
Here's the ThisWorkbook code:

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It appears after clicking "enable editing" in Excel 2010+. That is right after shutting down the protected view.