--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/extended/BranchProbabilityNode.java	Mon Nov 06 14:12:37 2017 -0500
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/extended/BranchProbabilityNode.java	Mon Nov 06 20:29:49 2017 -0800
@@ -82,6 +82,9 @@
 
     @Override
     public void simplify(SimplifierTool tool) {
+        if (!hasUsages()) {
+            return;
+        }
         if (probability.isConstant()) {
             double probabilityValue = probability.asJavaConstant().asDouble();
             if (probabilityValue < 0.0) {