diff --git a/plugins/XmlMaterialProfile/XmlMaterialProfile.py b/plugins/XmlMaterialProfile/XmlMaterialProfile.py
index ac63270a8e..24fa641ec4 100644
--- a/plugins/XmlMaterialProfile/XmlMaterialProfile.py
+++ b/plugins/XmlMaterialProfile/XmlMaterialProfile.py
@@ -1,4 +1,4 @@
-# Copyright (c) 2018 Ultimaker B.V.
+# Copyright (c) 2019 Ultimaker B.V.
 # Cura is released under the terms of the LGPLv3 or higher.
 
 import copy
@@ -60,6 +60,7 @@ class XmlMaterialProfile(InstanceContainer):
     def setMetaDataEntry(self, key, value, apply_to_all = True):
         registry = ContainerRegistry.getInstance()
         if registry.isReadOnly(self.getId()):
+            Logger.log("w", "Can't change metadata {key} of material {material_id} because it's read-only.".format(key = key, material_id = self.getId()))
             return
 
         # Prevent recursion
@@ -121,6 +122,8 @@ class XmlMaterialProfile(InstanceContainer):
         registry = ContainerRegistry.getInstance()
 
         base_file = self.getMetaDataEntry("base_file", "")
+        print("--------base_file:", base_file)
+        print("--------metadata:", self._metadata)
         if base_file and self.getId() != base_file:
             # Since we create an instance of XmlMaterialProfile for each machine and nozzle in the profile,
             # we should only serialize the "base" material definition, since that can then take care of