diff --git a/java/java-analysis-impl/src/com/intellij/codeInspection/bytecodeAnalysis/BytecodeAnalysisConverter.java b/java/java-analysis-impl/src/com/intellij/codeInspection/bytecodeAnalysis/BytecodeAnalysisConverter.java
index 38eaf83dbe2a..f29dd7f6cf0c 100644
--- a/java/java-analysis-impl/src/com/intellij/codeInspection/bytecodeAnalysis/BytecodeAnalysisConverter.java
+++ b/java/java-analysis-impl/src/com/intellij/codeInspection/bytecodeAnalysis/BytecodeAnalysisConverter.java
@@ -263,11 +263,12 @@ public class BytecodeAnalysisConverter implements ApplicationComponent {
 
 
   private int mkPsiClassKey(PsiClass psiClass, int dimensions) throws IOException {
-    PsiClassOwner psiFile = (PsiClassOwner) psiClass.getContainingFile();
-    if (psiFile == null) {
-      LOG.debug("getContainingFile was null for " + psiClass.getQualifiedName());
+    PsiFile containingFile = psiClass.getContainingFile();
+    if (!(containingFile instanceof PsiClassOwner)) {
+      LOG.debug("containingFile was not resolved for " + psiClass.getQualifiedName());
       return -1;
     }
+    PsiClassOwner psiFile = (PsiClassOwner)containingFile;
     String packageName = psiFile.getPackageName();
     String qname = psiClass.getQualifiedName();
     if (qname == null) {