diff --git a/rowers/dataroutines.py b/rowers/dataroutines.py
index 154d75f8..3acdf49e 100644
--- a/rowers/dataroutines.py
+++ b/rowers/dataroutines.py
@@ -2204,26 +2204,27 @@ def dataplep(rowdatadf, id=0, inboard=0.88, forceunit='lbs', bands=True, barchar
     if windowsize <= 3:
         windowsize = 5
 
+
     try:
-        df.with_columns(
+        df = df.with_columns(
             (pl.col(" Cadence (stokes/min)").map_batches(lambda x: savgol_filter(x.to_numpy(), windowsize, 3)).explode()
              ).alias(" Cadence (stokes/min)"))
-    except ComputeError:
+    except ComputeError as e:
         pass
     try:
-        df.with_columns(
+        df = df.with_columns(
             (pl.col(" DriveLength (meters)").map_batches(lambda x: savgol_filter(x.to_numpy(), windowsize, 3)).explode()
              ).alias(" DriveLength (meters)"))
     except ComputeError:
         pass
     try:
-        df.with_columns(
+        df = df.with_columns(
             (pl.col(" HRCur (bpm)").map_batches(lambda x: savgol_filter(x.to_numpy(), windowsize, 3)).explode()
              ).alias(" HRCur (bpm)"))
     except ComputeError:
         pass
     try:
-        df.with_columns((pl.col("forceratio").map_batches(lambda x: savgol_filter(x.to_numpy(), windowsize, 3)).explode()).alias("forceratio"))
+        df = df.with_columns((pl.col("forceratio").map_batches(lambda x: savgol_filter(x.to_numpy(), windowsize, 3)).explode()).alias("forceratio"))
     except ComputeError:
         pass