NPE (IDEA-120967)

platform/platform-impl/src/com/intellij/ide/ui/customization/CustomizableActionsPanel.java

@@ -493,7 +493,7 @@ public class CustomizableActionsPanel {
           setText(((QuickList)userObject).getName());
           icon = AllIcons.Actions.QuickList;
         }
-        else {
+        else if (userObject != null) {
           throw new IllegalArgumentException("unknown userObject: " + userObject);
         }
 

platform/platform-impl/src/com/intellij/openapi/keymap/impl/ui/ActionsTreeUtil.java

@@ -453,6 +453,7 @@ public class ActionsTreeUtil {
         node.add(childNode);
       }
       else {
+        LOG.assertTrue(child != null);
         node.add(new DefaultMutableTreeNode(child));
       }
     }