diff --git a/src/documents/serialisers.py b/src/documents/serialisers.py
index 385090082..ce2b0c48a 100644
--- a/src/documents/serialisers.py
+++ b/src/documents/serialisers.py
@@ -608,9 +608,6 @@ class TagSerializer(MatchingModelSerializer, OwnedObjectSerializer):
                 # Temporarily set tn_parent in-memory to validate clean()
                 self.instance.tn_parent = parent
                 self.instance.clean()
-            except ValueError as e:
-                logger.debug("Tag parent validation failed: %s", e)
-                raise serializers.ValidationError({"parent": _("Invalid parent tag.")})
             except ValidationError as e:
                 logger.debug("Tag parent validation failed: %s", e)
                 raise e