fix

rowers/views/analysisviews.py

@@ -769,8 +769,10 @@ def cpdata(workouts, options):
             minutevalue = int(tvalue)
         except TypeError:  # pragma: no cover
             minutevalue = 0
-
-        tvalue = int(60*(tvalue-minutevalue))
+        try:
+            tvalue = int(60*(tvalue-minutevalue))
+        except TypeError:  # pragma: no cover
+            tvalue = int(60*tvalue)
 
         if hourvalue >= 24:  # pragma: no cover
             hourvalue = 23