diff --git a/rowers/tasks.py b/rowers/tasks.py
index a0d9986e..c30a7f19 100644
--- a/rowers/tasks.py
+++ b/rowers/tasks.py
@@ -625,6 +625,8 @@ def handle_calctrimp(id,
         csvfile = csvfilename+'.csv'
     elif os.path.exists(csvfilename+'.gz'):
         csvfile = csvfilename+'.gz'
+    else:
+        return 0
 
     csvfile = os.path.abspath(csvfile)