diff --git a/idea/src/org/jetbrains/kotlin/idea/projectView/KtClassOrObjectTreeNode.kt b/idea/src/org/jetbrains/kotlin/idea/projectView/KtClassOrObjectTreeNode.kt
index c8c9c5225c5..d8b165aad3f 100644
--- a/idea/src/org/jetbrains/kotlin/idea/projectView/KtClassOrObjectTreeNode.kt
+++ b/idea/src/org/jetbrains/kotlin/idea/projectView/KtClassOrObjectTreeNode.kt
@@ -50,7 +50,7 @@ class KtClassOrObjectTreeNode(project: Project?, ktClassOrObject: KtClassOrObjec
     private fun update(node: AbstractTreeNode<*>) {
         val project = project
         if (project != null) {
-            ProjectView.getInstance(project).currentProjectViewPane.treeBuilder.addSubtreeToUpdateByElement(node)
+            ProjectView.getInstance(project).currentProjectViewPane?.treeBuilder?.addSubtreeToUpdateByElement(node)
         }
     }