diff --git a/platform/core-impl/src/com/intellij/psi/stubs/ObjectStubTree.java b/platform/core-impl/src/com/intellij/psi/stubs/ObjectStubTree.java
index 51120e62d0c1..7c05e4e4905c 100644
--- a/platform/core-impl/src/com/intellij/psi/stubs/ObjectStubTree.java
+++ b/platform/core-impl/src/com/intellij/psi/stubs/ObjectStubTree.java
@@ -20,6 +20,7 @@ import gnu.trove.THashMap;
 import gnu.trove.TObjectObjectProcedure;
 import gnu.trove.TObjectProcedure;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -92,7 +93,8 @@ public class ObjectStubTree<T extends Stub> {
     myDebugInfo = info;
   }
 
-  static ObjectStubTree getStubTree(ObjectStubBase root) {
+  @Nullable
+  public static ObjectStubTree getStubTree(@NotNull ObjectStubBase root) {
     return root.getUserData(STUB_TO_TREE_REFERENCE);
   }