diff --git a/src/share/vm/c1/c1_GraphBuilder.cpp b/src/share/vm/c1/c1_GraphBuilder.cpp
index 1d0b9243de206a21644db1b8c7fe1a8fa3b76a53..b7ea6eebb26046dad24ebbbde3aec7e6fd9b6ac3 100644
--- a/src/share/vm/c1/c1_GraphBuilder.cpp
+++ b/src/share/vm/c1/c1_GraphBuilder.cpp
@@ -1583,7 +1583,7 @@ void GraphBuilder::access_field(Bytecodes::Code code) {
       ObjectType* obj_type = obj->type()->as_ObjectType();
       if (obj_type->is_constant() && !PatchALot) {
         ciObject* const_oop = obj_type->constant_value();
-        if (!const_oop->is_null_object()) {
+        if (!const_oop->is_null_object() && const_oop->is_loaded()) {
           if (field->is_constant()) {
             ciConstant field_val = field->constant_value_of(const_oop);
             BasicType field_type = field_val.basic_type();
diff --git a/src/share/vm/ci/ciInstance.cpp b/src/share/vm/ci/ciInstance.cpp
index 2d29c0dc8e2ce7c8ad85133ac13b5f737bf7cd7b..a74eb04f4a7359178f61db5b6a749f0d8a07996e 100644
--- a/src/share/vm/ci/ciInstance.cpp
+++ b/src/share/vm/ci/ciInstance.cpp
@@ -60,10 +60,10 @@ ciType* ciInstance::java_mirror_type() {
 //
 // Constant value of a field.
 ciConstant ciInstance::field_value(ciField* field) {
-  assert(is_loaded() &&
-         field->holder()->is_loaded() &&
-         klass()->is_subclass_of(field->holder()),
-         "invalid access");
+  assert(is_loaded(), "invalid access - must be loaded");
+  assert(field->holder()->is_loaded(), "invalid access - holder must be loaded");
+  assert(klass()->is_subclass_of(field->holder()), "invalid access - must be subclass");
+
   VM_ENTRY_MARK;
   ciConstant result;
   Handle obj = get_oop();