diff --git a/rowers/dataprep.py b/rowers/dataprep.py
index 871087d9..897805b3 100644
--- a/rowers/dataprep.py
+++ b/rowers/dataprep.py
@@ -2231,7 +2231,7 @@ def dataprep(rowdatadf, id=0, bands=True, barchart=True, otwpower=True,
         time_increments = rowdatadf.loc[:, ' ElapsedTime (sec)'].diff()
         try:
             time_increments.iloc[0] = time_increments.iloc[1]
-        except KeyError:
+        except (KeyError, IndexError):
             time_increments.iloc[0] = 1.
             
         time_increments = 0.5 * time_increments + 0.5 * np.abs(time_increments)
diff --git a/rowers/tests/testdata/testdata.csv.gz b/rowers/tests/testdata/testdata.csv.gz
index 67407511..5f55865e 100644
Binary files a/rowers/tests/testdata/testdata.csv.gz and b/rowers/tests/testdata/testdata.csv.gz differ