diff --git a/source/dcp.py b/source/dcp.py
index cf5a846c6cccf3242f037a005b1443d20fb10f9a..2ca655e5b24f229cab49aeef92fdc9c3eca14516 100755
--- a/source/dcp.py
+++ b/source/dcp.py
@@ -157,7 +157,7 @@ class DCP:
         try:
             self.duration = max ([x.duration for x in self.assets if hasattr (x, 'duration')])
         except:
-            pass
+            self.duration = 'Unknown'
 
 
 if __name__ == '__main__':