diff --git a/platform/lang-impl/src/com/intellij/ide/projectView/BaseProjectTreeBuilder.java b/platform/lang-impl/src/com/intellij/ide/projectView/BaseProjectTreeBuilder.java
index ef4d3b2750b5..c4812459da8d 100644
--- a/platform/lang-impl/src/com/intellij/ide/projectView/BaseProjectTreeBuilder.java
+++ b/platform/lang-impl/src/com/intellij/ide/projectView/BaseProjectTreeBuilder.java
@@ -342,6 +342,7 @@ public abstract class BaseProjectTreeBuilder extends AbstractTreeBuilder {
 
         yield(new Runnable() {
           public void run() {
+            if (isDisposed()) return;
             expandChild(kids, 0, nonStopCondition, file, element, async, indicator, target);
           }
         });