--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.word/src/org/graalvm/compiler/word/WordOperationPlugin.java	Thu Nov 15 21:05:47 2018 +0100
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.word/src/org/graalvm/compiler/word/WordOperationPlugin.java	Thu Nov 15 09:04:07 2018 -0800
@@ -317,8 +317,9 @@
                 if (args.length == 2) {
                     location = any();
                 } else {
-                    assert args[2].isConstant();
+                    assert args[2].isConstant() : args[2];
                     location = snippetReflection.asObject(LocationIdentity.class, args[2].asJavaConstant());
+                    assert location != null : snippetReflection.asObject(Object.class, args[2].asJavaConstant());
                 }
                 b.push(returnKind, readOp(b, readKind, address, location, operation.opcode()));
                 break;