diff --git a/plugins/XmlMaterialProfile/XmlMaterialProfile.py b/plugins/XmlMaterialProfile/XmlMaterialProfile.py
index 7f8c34a873..6dcd5a5ccc 100644
--- a/plugins/XmlMaterialProfile/XmlMaterialProfile.py
+++ b/plugins/XmlMaterialProfile/XmlMaterialProfile.py
@@ -540,8 +540,7 @@ class XmlMaterialProfile(InstanceContainer):
 
         validation_message = XmlMaterialValidator.validateMaterialMetaData(meta_data)
         if validation_message is not None:
-            return
-            # raise Exception("Not valid material profile: %s" % (validation_message))
+            raise Exception("Not valid material profile: %s" % (validation_message))
 
         property_values = {}
         properties = data.iterfind("./um:properties/*", self.__namespaces)