src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/meta/HotSpotWordOperationPlugin.java

@@ -119,11 +119,11 @@
             case IS_NULL:
                 assert args.length == 1;
                 ValueNode pointer = args[0];
                 assert pointer.stamp(NodeView.DEFAULT) instanceof MetaspacePointerStamp;
 
-                LogicNode isNull = b.addWithInputs(IsNullNode.create(pointer));
+                LogicNode isNull = b.add(IsNullNode.create(pointer));
                 b.addPush(returnKind, ConditionalNode.create(isNull, b.add(forBoolean(true)), b.add(forBoolean(false)), NodeView.DEFAULT));
                 break;
 
             case FROM_POINTER:
                 assert args.length == 1;