diff --git a/platform/lang-impl/src/com/intellij/ide/projectView/impl/nodes/ModuleGroupNode.java b/platform/lang-impl/src/com/intellij/ide/projectView/impl/nodes/ModuleGroupNode.java
index 245e5eedb1ce..9751524445fc 100644
--- a/platform/lang-impl/src/com/intellij/ide/projectView/impl/nodes/ModuleGroupNode.java
+++ b/platform/lang-impl/src/com/intellij/ide/projectView/impl/nodes/ModuleGroupNode.java
@@ -91,6 +91,11 @@ public abstract class ModuleGroupNode extends ProjectViewNode<ModuleGroup> imple
     return someChildContainsFile(file, false);
   }
 
+  @Override
+  public boolean validate() {
+    return getValue() != null;
+  }
+
   @Override
   public void update(PresentationData presentation) {
     final String[] groupPath = getValue().getGroupPath();