--- a/src/jdk.internal.vm.ci/share/classes/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotResolvedJavaMethodImpl.java	Tue Oct 23 09:43:16 2018 -0700
+++ b/src/jdk.internal.vm.ci/share/classes/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotResolvedJavaMethodImpl.java	Tue Oct 23 18:49:32 2018 +0200
@@ -725,7 +725,7 @@
             return config().invalidVtableIndex;
         }
         if (holder.isInterface()) {
-            if (resolved.isInterface()) {
+            if (resolved.isInterface() || !resolved.isLinked()) {
                 return config().invalidVtableIndex;
             }
             return getVtableIndexForInterfaceMethod(resolved);