diff --git a/src/org/intellij/sequencer/SequencePlugin2.java b/src/org/intellij/sequencer/SequencePlugin2.java
index f6e160cc..ad2dc886 100644
--- a/src/org/intellij/sequencer/SequencePlugin2.java
+++ b/src/org/intellij/sequencer/SequencePlugin2.java
@@ -82,10 +82,15 @@ public static SequencePlugin2 getInstance(Project project) {
     }
 
     public void projectClosed() {
-        try{
+        try {
             getToolWindowManager().unregisterToolWindow(PLAGIN_NAME);
         } catch (AlreadyDisposedException e) {
-
+            //ignore
+        } catch (IllegalStateException e) {
+            if (!e.getMessage().startsWith("Project-level session is not set")) {
+                throw e;
+            }
+            //else ignore
         }
     }