diff --git a/rowers/dataroutines.py b/rowers/dataroutines.py
index ff0a8440..0e893166 100644
--- a/rowers/dataroutines.py
+++ b/rowers/dataroutines.py
@@ -1875,7 +1875,9 @@ def dataprep(rowdatadf, id=0, bands=True, barchart=True, otwpower=True,
         except FileNotFoundError:
             df2 = dd.from_pandas(df, npartitions=1)
             df2.to_parquet(filename, engine='fastparquet', compression='GZIP')
-
+        except FileExistsError:
+            os.remove(filename)
+            df.to_parquet(filename, engine='fastparquet', compression='GZIP')
     return data
 
 
diff --git a/rowers/tests/testdata/testdata.tcx.gz b/rowers/tests/testdata/testdata.tcx.gz
index 17b31447..b4427762 100644
Binary files a/rowers/tests/testdata/testdata.tcx.gz and b/rowers/tests/testdata/testdata.tcx.gz differ
diff --git a/rowers/views/racesviews.py b/rowers/views/racesviews.py
index 860c58cd..62e0497a 100644
--- a/rowers/views/racesviews.py
+++ b/rowers/views/racesviews.py
@@ -370,11 +370,14 @@ def course_view(request, id=0):
         coursecompleted=True).order_by("duration", "-distance")
 
     # get own training results
-    ownrecords = CourseTestResult.objects.filter(
-        courseid = course.id,
-        userid = r.id,
-        coursecompleted=True
-    ).order_by("duration", "-distance")
+    if not request.user.is_anonymous:
+        ownrecords = CourseTestResult.objects.filter(
+            courseid = course.id,
+            userid = r.id,
+            coursecompleted=True
+        ).order_by("duration", "-distance")
+    else:
+        ownrecords = []
 
     if request.user.is_authenticated:
         notsharing = Rower.objects.filter(