1 files changed, 2 insertions, 1 deletions

diff --git a/MAT/mat.py b/MAT/mat.py
index 8c92a33..af12466 100644
--- a/MAT/mat.py
+++ b/MAT/mat.py
@@ -144,7 +144,8 @@ def create_class_file(name, backup, **kwargs):
     mime = parser.mime_type
 
     if mime == 'application/zip':  # some formats are zipped stuff
-        mime = mimetypes.guess_type(name)[0]
+        if mimetypes.guess_type(name)[0] is not None:
+            mime =  mimetypes.guess_type(name)[0]
 
     if mime.startswith('application/vnd.oasis.opendocument'):
         mime = 'application/opendocument'  # opendocument fileformat