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Ruby FileUtils.mkpath behaves differently in different environments

I have a rails application that contains a simple piece of code to create a directory if it does not exist.

FileUtils.mkpath(self.webapp_dir) unless File.exists?(self.webapp_dir)

This behaves as expected on my development workstation (OS X 10.9), but I get errors when deploying to other environments (Red Hat 4.4.6-3).

In my rails console, I ran the following:

FileUtils.mkpath('/path/to/my/project/public/web_apps/1')

Please note that the first time there is "public / web_apps /", but "1" does not work. It succeeds. I can start it again with all the existing circuit, and every time it is deleted without errors.

Now I am trying to run the same code in the rails console in a production environment. Again, "public / web_apps /" already exists, but "1" does not. In this case, I get an error.

FileUtils.mkpath('/path/to/my/project/public/web_apps/1')
--> Errno::EEXIST: File exists - /path/to/my/project/public/web_apps

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