diff --git a/java/java-psi-impl/src/com/intellij/psi/impl/source/resolve/graphInference/InferenceSession.java b/java/java-psi-impl/src/com/intellij/psi/impl/source/resolve/graphInference/InferenceSession.java
index 16f27712b838..25406c5c3e6d 100644
--- a/java/java-psi-impl/src/com/intellij/psi/impl/source/resolve/graphInference/InferenceSession.java
+++ b/java/java-psi-impl/src/com/intellij/psi/impl/source/resolve/graphInference/InferenceSession.java
@@ -1615,7 +1615,10 @@ public class InferenceSession {
 
       if (methodContainingClass != null) {
         psiSubstitutor = TypeConversionUtil.getClassSubstitutor(methodContainingClass, containingClass, psiSubstitutor);
-        LOG.assertTrue(psiSubstitutor != null, "derived: " + containingClass + "; super: " + methodContainingClass);
+        LOG.assertTrue(psiSubstitutor != null, "derived: " + containingClass +
+                                               "; super: " + methodContainingClass +
+                                               "; reference: " + reference.getText() +
+                                               "; containingFile: " + reference.getContainingFile().getName());
       }
 
       for (int i = 0; i < functionalMethodParameters.length; i++) {