diff --git a/rowers/c2stuff.py b/rowers/c2stuff.py
index 9641a41a..dd345736 100644
--- a/rowers/c2stuff.py
+++ b/rowers/c2stuff.py
@@ -300,10 +300,14 @@ def summaryfromsplitdata(splitdata,data,filename,sep='|'):
 
         sa += iarr
         results += resarr
+
+        if itime != 0:
+            ivelo = idist/itime
+            ipower = 2.8*ivelo**(3.0)
+        else:
+            ivelo = 0
+            ipower = 0
             
-        ivelo = idist/itime
-        ipower = 2.8*ivelo**(3.0)
-        
         sums += interval_string(intervalnr,idist,itime,ipace,ispm,
                                 iavghr,imaxhr,0,ipower,separator=sep)
         intervalnr+=1
diff --git a/rowers/tests/testdata/testdata.csv.gz b/rowers/tests/testdata/testdata.csv.gz
index 6ed5eac5..8e35d372 100644
Binary files a/rowers/tests/testdata/testdata.csv.gz and b/rowers/tests/testdata/testdata.csv.gz differ
diff --git a/rowers/tests/testdata/testdata.tcx b/rowers/tests/testdata/testdata.tcx
index c01f9702..f49f35e9 100644
--- a/rowers/tests/testdata/testdata.tcx
+++ b/rowers/tests/testdata/testdata.tcx
@@ -2502,7 +2502,7 @@
           </Trackpoint>
         </Track>
       </Lap>
-      <Notes>&lt;Element 'Notes' at 0x1913e400&gt;</Notes>
+      <Notes>&lt;Element 'Notes' at 0x11aaf780&gt;</Notes>
     </Activity>
   </Activities>
   <Creator>