diff -r 5b2885cf720f -r e4b77545c2f1 src/pyams_portal/zmi/layout.py
--- a/src/pyams_portal/zmi/layout.py	Wed Sep 02 17:22:47 2020 +0200
+++ b/src/pyams_portal/zmi/layout.py	Mon Nov 23 17:20:28 2020 +0100
@@ -527,29 +527,33 @@
             portlet_config.inherit_parent = False
         else:
             portlet_config.inherit_parent = True
+        # update settings
         changed_override = portlet_config.inherit_parent != old_override
-        # update settings
-        editor = request.registry.queryMultiAdapter((portlet_config.editor_settings, request),
-                                                    IPagelet, name='properties.json')
-        if editor is None:
-            raise NotFound()
-        changes = editor()
-        # clear portlets cache on settings update
+        if changed_override:
+            translate = self.request.localizer.translate
+            changes = {
+                'status': 'success',
+                'message': translate(self.successMessage)
+            }
+        else:
+            # get edit output
+            editor = request.registry.queryMultiAdapter((portlet_config.editor_settings, request),
+                                                        IPagelet, name='properties.json')
+            if editor is None:
+                raise NotFound()
+            changes = editor()
         if changes:
+            # clear portlets cache on settings update
             portlets_cache = get_cache(PORTLETS_CACHE_REGION, PORTLETS_CACHE_NAME)
             portlets_cache.clear()
-        # get edit output
-        translate = self.request.localizer.translate
-        if changed_override or changes:
             # we commit before loading previewer to avoid BLOBs "uncommitted changes" error
             ITransactionManager(self.context).commit()
-            previewer = request.registry.queryMultiAdapter((self.context, request, self, portlet_config.settings),
+            previewer = request.registry.queryMultiAdapter((self.context, request, self,
+                                                            portlet_config.settings),
                                                            IPortletPreviewer)
             if previewer is not None:
                 previewer.update()
                 changes.update({
-                    'status': 'success',
-                    'message': translate(self.successMessage),
                     'callback': 'PyAMS_portal.template.editPortletCallback',
                     'options': {
                         'portlet_id': portlet_id,