File name is not appearing in CF8 application.log

There are quite a few errors in my CF8 Application.log file that look like this:

String index out of range: -1 The specific sequence of files included or processed is: ''''

Why is the file name blank and what's the best way to go about troubleshooting this error?

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Inspiring

The problem has been identified: someone or something has been hitting a blank .cfm template on my site: http://www.someurl.com/..cfm

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