diff --git a/pipenv/cli.py b/pipenv/cli.py
index 712178b0..a55bd196 100644
--- a/pipenv/cli.py
+++ b/pipenv/cli.py
@@ -398,7 +398,7 @@ def ensure_project(three=None, python=None, validate=True, system=False, warn=Tr
 
                 path_to_python = which('python')
 
-                if project.required_python_version not in python_version(path_to_python):
+                if project.required_python_version not in python_version(path_to_python) or '':
                     puts(
                         '{0}: Your Pipfile requires {1} {2}, '
                         'but you are using {3} ({4}).'.format(