diff --git a/plugins/groovy/src/org/jetbrains/plugins/groovy/lang/resolve/processors/ResolverProcessor.java b/plugins/groovy/src/org/jetbrains/plugins/groovy/lang/resolve/processors/ResolverProcessor.java
index e8ab1ac19cdf..6e43941c109a 100644
--- a/plugins/groovy/src/org/jetbrains/plugins/groovy/lang/resolve/processors/ResolverProcessor.java
+++ b/plugins/groovy/src/org/jetbrains/plugins/groovy/lang/resolve/processors/ResolverProcessor.java
@@ -110,7 +110,7 @@ public class ResolverProcessor implements PsiScopeProcessor, NameHint, ClassHint
 
   protected final void addCandidate(GroovyResolveResult candidate) {
     PsiElement element = candidate.getElement();
-    assert element == null || element.isValid() : "invalid resolve candidate";
+    assert element == null || element.isValid() : "invalid resolve candidate: " + element.getClass();
 
     if (myCandidates == null) myCandidates = new ArrayList<GroovyResolveResult>();
     myCandidates.add(candidate);