diff --git a/java/java-impl/src/com/intellij/psi/impl/migration/PsiMigrationManager.java b/java/java-impl/src/com/intellij/psi/impl/migration/PsiMigrationManager.java
index 76b6b00cf84c..7a363c9e1462 100644
--- a/java/java-impl/src/com/intellij/psi/impl/migration/PsiMigrationManager.java
+++ b/java/java-impl/src/com/intellij/psi/impl/migration/PsiMigrationManager.java
@@ -51,9 +51,7 @@ public class PsiMigrationManager {
    */
   @NotNull
   public PsiMigration startMigration() {
-    if (myCurrentMigration != null) {
-      LOG.assertTrue(myCurrentMigration == null);
-    }
+    LOG.assertTrue(myCurrentMigration == null);
     myCurrentMigration = new PsiMigrationImpl(this, JavaPsiFacade.getInstance(myProject),
                                               (PsiManagerImpl)PsiManager.getInstance(myProject));
     return myCurrentMigration;