diff --git a/mdtogh/transform.py b/mdtogh/transform.py
index 33eb3a1..ef4fc39 100644
--- a/mdtogh/transform.py
+++ b/mdtogh/transform.py
@@ -84,6 +84,9 @@ def transform(paths = None, cache_path = None, system_css = False, css = False,
     except requests.RequestException as e:
         print "\nError occur when request for github: ", e
         exception_occur = True
+    except RuntimeError as e:
+        print "\nRunTime Error:", e
+        exception_occur = True
 
     #save renderer data 
     __save_content_toc(contents, tocs, offline)