diff --git a/rowers/tasks.py b/rowers/tasks.py
index 7b43f34f..cef30175 100644
--- a/rowers/tasks.py
+++ b/rowers/tasks.py
@@ -611,9 +611,12 @@ def handle_calctrimp(id,
     v4mean = wavg(df,'v4','deltat')
     normv = v4mean**(1./pp)
 
-    df['w4'] = df['driveenergy']**(pp)
-    w4mean = wavg(df,'w4','deltat')
-    normw = w4mean**(1./pp)
+    try:
+        df['w4'] = df['driveenergy']**(pp)
+        w4mean = wavg(df,'w4','deltat')
+        normw = w4mean**(1./pp)
+    except KeyError:
+        normw = 0
         
 
     if np.isnan(normv):