diff --git a/compiler/frontend/src/org/jetbrains/jet/lang/resolve/DeclarationResolver.java b/compiler/frontend/src/org/jetbrains/jet/lang/resolve/DeclarationResolver.java
index e108a350e77..49dd267746c 100644
--- a/compiler/frontend/src/org/jetbrains/jet/lang/resolve/DeclarationResolver.java
+++ b/compiler/frontend/src/org/jetbrains/jet/lang/resolve/DeclarationResolver.java
@@ -30,6 +30,7 @@ import org.jetbrains.jet.lang.resolve.scopes.JetScope;
 import org.jetbrains.jet.lang.resolve.scopes.WritableScope;
 import org.jetbrains.jet.lang.types.ErrorUtils;
 import org.jetbrains.jet.lang.types.lang.JetStandardLibrary;
+import org.jetbrains.jet.resolve.DescriptorRenderer;
 
 import javax.inject.Inject;
 import java.util.*;
@@ -302,7 +303,8 @@ public class DeclarationResolver {
                 if (descriptors.size() > 1) {
                     for (DeclarationDescriptor declarationDescriptor : descriptors) {
                         for (PsiElement declaration : getDeclarationsByDescriptor(declarationDescriptor)) {
-                            assert declaration != null;
+                            assert declaration != null : "Null declaration for descriptor: " + declarationDescriptor + " " +
+                                                         (declarationDescriptor != null ? DescriptorRenderer.TEXT.render(declarationDescriptor) : "");
                             trace.report(REDECLARATION.on(declaration, declarationDescriptor.getName().getName()));
                         }
                     }