diff --git a/Utils.py b/Utils.py
index 35a71473..58883da0 100644
--- a/Utils.py
+++ b/Utils.py
@@ -125,7 +125,8 @@ class UniqueKeyLoader(SafeLoader):
         for key_node, value_node in node.value:
             key = self.construct_object(key_node, deep=deep)
             if key in mapping:
-                raise KeyError(f"Duplicate key {key!r} found in YAML. Already found keys: {mapping}.")
+                logging.error(f"YAML duplicates sanity check failed{key_node.start_mark}")
+                raise KeyError(f"Duplicate key {key} found in YAML. Already found keys: {mapping}.")
             mapping.add(key)
         return super().construct_mapping(node, deep)