From 158cef94a09ce358b12a038964b938664b5b52bf Mon Sep 17 00:00:00 2001
From: Javier Garcia-Bernardo <j.garciabernardo@uu.nl>
Date: Thu, 20 Jun 2024 13:02:30 +0200
Subject: [PATCH] add return

---
 netcbs/netcbs.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/netcbs/netcbs.py b/netcbs/netcbs.py
index b99ef15..e19516d 100644
--- a/netcbs/netcbs.py
+++ b/netcbs/netcbs.py
@@ -190,6 +190,9 @@ def convert_to_polars(df: Union[pl.DataFrame, pl.LazyFrame, pd.DataFrame], lazy:
             return df.collect()
         else:
             return df
+    else:
+        raise ValueError('The dataframe is not a valid type')
+        
     
 def transform(
     query: str,