If you're using TurboTax Online, try closing the program, clear your Cache and Cookies, and see if you can Continue after the 1099-R section.
If you're using TurboTax Desktop, go to FORMS, then Open Form 8915 and Delete it from your return.
Here's How to Delete Forms in TurboTax Online.
If this doesn't resolve your issue, here's how to Contact TurboTax Support
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