diff --git a/requests/models.py b/requests/models.py
index f33c3c3e..2193c6e5 100644
--- a/requests/models.py
+++ b/requests/models.py
@@ -828,10 +828,12 @@ class Response(object):
         # Decode unicode from given encoding.
         try:
             content = str(self.content, encoding, errors='replace')
-        except LookupError:
+        except (LookupError, TypeError):
             # A LookupError is raised if the encoding was not found which could
             # indicate a misspelling or similar mistake.
             #
+            # A TypeError can be raised if encoding is None
+            #
             # So we try blindly encoding.
             content = str(self.content, errors='replace')