diff --git a/python/python-psi-impl/src/com/jetbrains/python/psi/impl/PyClassImpl.java b/python/python-psi-impl/src/com/jetbrains/python/psi/impl/PyClassImpl.java
index 217e8144e071..ccfa922fbf2e 100644
--- a/python/python-psi-impl/src/com/jetbrains/python/psi/impl/PyClassImpl.java
+++ b/python/python-psi-impl/src/com/jetbrains/python/psi/impl/PyClassImpl.java
@@ -1323,12 +1323,8 @@ public class PyClassImpl extends PyBaseElementImpl<PyClassStub> implements PyCla
   public void subtreeChanged() {
     super.subtreeChanged();
     ControlFlowCache.clear(this);
-    if (myInstanceAttributes != null) {
-      myInstanceAttributes = null;
-    }
-    if (myFallbackInstanceAttributes != null) {
-      myFallbackInstanceAttributes = null;
-    }
+    myInstanceAttributes = null;
+    myFallbackInstanceAttributes = null;
     myLocalPropertyCache = null;
   }