From 5035d497e91028c393fb1278243b6c950fedefa2 Mon Sep 17 00:00:00 2001
From: Theo Sanderson <theo@sndrsn.co.uk>
Date: Wed, 13 Sep 2023 00:02:00 +0100
Subject: [PATCH] Update utils.py

---
 taxoniumtools/src/taxoniumtools/utils.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/taxoniumtools/src/taxoniumtools/utils.py b/taxoniumtools/src/taxoniumtools/utils.py
index 344e28a4..bb089540 100644
--- a/taxoniumtools/src/taxoniumtools/utils.py
+++ b/taxoniumtools/src/taxoniumtools/utils.py
@@ -28,7 +28,7 @@ def read_metadata(metadata_file, columns, key_column):
         metadata.set_index(key_column, inplace=True)
         # convert metadata to dict of rows
         if not metadata.index.is_unique:
-            print(
+            raise ValueError(
                 f"Error: The key column '{key_column}' contains non-unique values in the metadata file."
             )