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 a2fb17f2015a..d2037b8bab88 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
@@ -1447,7 +1447,8 @@ public class InferenceSession {
     if (arg instanceof PsiMethodReferenceExpression && ((PsiMethodReferenceExpression)arg).isExact()) {
       final PsiParameter[] sParameters = sInterfaceMethod.getParameterList().getParameters();
       final PsiParameter[] tParameters = tInterfaceMethod.getParameterList().getParameters();
-      LOG.assertTrue(sParameters.length == tParameters.length);
+      LOG.assertTrue(sParameters.length == tParameters.length, 
+                     "s: " + sInterfaceMethod.getParameterList().getText() + "; t: " + tInterfaceMethod.getParameterList().getText());
       for (int i = 0; i < tParameters.length; i++) {
         final PsiType tSubstituted = tSubstitutor.substitute(tParameters[i].getType());
         final PsiType sSubstituted = sSubstitutor.substitute(sParameters[i].getType());
@@ -1471,7 +1472,7 @@ public class InferenceSession {
 
       if (sPrimitive ^ tPrimitive) {
         final PsiMember member = ((PsiMethodReferenceExpression)arg).getPotentiallyApplicableMember();
-        LOG.assertTrue(member != null);
+        LOG.assertTrue(member != null, arg);
         if (member instanceof PsiMethod) {
           final PsiType methodReturnType = ((PsiMethod)member).getReturnType();
           if (sPrimitive && methodReturnType instanceof PsiPrimitiveType && methodReturnType != PsiType.VOID ||