diff --git a/frontends/src/jp/cmd_blog.py b/frontends/src/jp/cmd_blog.py
index 0fedf5c5..29fb7cfc 100644
--- a/frontends/src/jp/cmd_blog.py
+++ b/frontends/src/jp/cmd_blog.py
@@ -147,7 +147,7 @@ class BlogCommon(object):
         ext = os.path.splitext(path)[1][1:] # we get extension without the '.'
         if ext:
             for k,v in SYNTAX_EXT.iteritems():
-                if ext == v:
+                if k and ext == v:
                     return k
 
         # if not found, we use current syntax