diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5819916a0..3682f6cc0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,8 @@
 Changelog
 =========
+### 4.3.12 - March 6, 2019 - hot fix release
+- Fix error caused when virtual environment not detected
+
 ### 4.3.11 - March 6, 2019 - hot fix release
 - Fixed issue #876: confused by symlinks pointing to virtualenv gives FIRSTPARTY not THIRDPARTY
 - Fixed issue #873: current version skips every file on travis
diff --git a/isort/__init__.py b/isort/__init__.py
index ca921a53e..6d5189203 100644
--- a/isort/__init__.py
+++ b/isort/__init__.py
@@ -25,4 +25,4 @@
 from . import settings  # noqa: F401
 from .isort import SortImports  # noqa: F401
 
-__version__ = "4.3.11"
+__version__ = "4.3.12"
diff --git a/isort/finders.py b/isort/finders.py
index 537e8491f..fc9e8cf7a 100644
--- a/isort/finders.py
+++ b/isort/finders.py
@@ -140,7 +140,8 @@ def __init__(self, config, sections):
 
         # virtual env
         self.virtual_env = self.config.get('virtual_env') or os.environ.get('VIRTUAL_ENV')
-        self.virtual_env = os.path.realpath(self.virtual_env)
+        if self.virtual_env:
+            self.virtual_env = os.path.realpath(self.virtual_env)
         self.virtual_env_src = False
         if self.virtual_env:
             self.virtual_env_src = '{0}/src/'.format(self.virtual_env)
diff --git a/setup.py b/setup.py
index 1af81cb5c..f284e1695 100755
--- a/setup.py
+++ b/setup.py
@@ -6,7 +6,7 @@
     readme = f.read()
 
 setup(name='isort',
-      version='4.3.11',
+      version='4.3.12',
       description='A Python utility / library to sort Python imports.',
       long_description=readme,
       author='Timothy Crosley',