diff --git a/java/java-impl/src/com/intellij/psi/impl/compiled/ClsFileImpl.java b/java/java-impl/src/com/intellij/psi/impl/compiled/ClsFileImpl.java
index 0e43b5833212..d5456a33e452 100644
--- a/java/java-impl/src/com/intellij/psi/impl/compiled/ClsFileImpl.java
+++ b/java/java-impl/src/com/intellij/psi/impl/compiled/ClsFileImpl.java
@@ -54,10 +54,7 @@ import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 import java.lang.ref.SoftReference;
-import java.util.Collections;
-import java.util.List;
-import java.util.Map;
-import java.util.Set;
+import java.util.*;
 
 public class ClsFileImpl extends ClsRepositoryPsiElement<PsiClassHolderFileStub> implements PsiJavaFile, PsiFileWithStubSupport, PsiFileEx,
                                                                                             Queryable, PsiClassOwnerEx {
@@ -240,8 +237,9 @@ public class ClsFileImpl extends ClsRepositoryPsiElement<PsiClassHolderFileStub>
       // Can happen for package-info.class, or classes compiled from languages, that support different class naming scheme, like Scala.
       if (classes.length != 1 || JavaPsiFacade.getInstance(getProject()).getNameHelper().isIdentifier(classes[0].getName())) {
         PsiClass[] mirrorClasses = ((PsiJavaFile)mirrorFile).getClasses();
-        LOG.assertTrue(classes.length == mirrorClasses.length);
-        if (classes.length == mirrorClasses.length) {
+        if (classes.length != mirrorClasses.length) {
+          LOG.error("file: " + mirrorFile + " classes: " + Arrays.toString(classes) + " mirrors: " + Arrays.toString(mirrorClasses));
+        } else {
           for (int i = 0; i < classes.length; i++) {
             ((ClsElementImpl)classes[i]).setMirror((TreeElement)SourceTreeToPsiMap.psiElementToTree(mirrorClasses[i]));
           }