fixing errors

rowers/views/analysisviews.py

@@ -5,6 +5,7 @@ from jinja2 import Environment, FileSystemLoader
 from rowers.rower_rules import can_view_session
 
 from django.forms.widgets import SelectDateWidget, HiddenInput
+from polars.exceptions import ComputeError
 
 def floatformat(x, prec=2):  # pragma: no cover
     return '{x}'.format(x=round(x, prec))
@@ -945,8 +946,10 @@ def boxplotdata(workouts, options):
     except ColumnNotFoundError:
         pass
             
-
-    datadf = datadf.with_columns((pl.col("workoutid").apply(lambda x: datemapping[x])).alias("date"))
+    try:
+        datadf = datadf.with_columns((pl.col("workoutid").apply(lambda x: datemapping[x])).alias("date"))
+    except ComputeError:
+        return ("","No Valid Data")
 
     if userid == 0:  # pragma: no cover
         extratitle = ''