diff --git a/data/QUGS/convert.py b/data/QUGS/convert.py
index d495b0d..6e95377 100644
--- a/data/QUGS/convert.py
+++ b/data/QUGS/convert.py
@@ -133,10 +133,7 @@ class DataProcessor:
 
         # Fill the list with data
         for group_idx, file_list in self.file_index.items():
-            # Adjust index to be 0-based
-            list_idx = group_idx
-            data[list_idx] = [self._load_dataframe(file) for file in file_list]
-
+            data[group_idx] = [self._load_dataframe(file) for file in file_list]
         return data
 
     def get_group_data(self, group_idx: int) -> List[pd.DataFrame]: