--- a/src/jdk.jfr/share/classes/jdk/jfr/consumer/ConstantLookup.java	Thu Jul 11 02:18:31 2019 +0200
+++ b/src/jdk.jfr/share/classes/jdk/jfr/consumer/ConstantLookup.java	Thu Jul 11 02:21:18 2019 +0200
@@ -22,7 +22,7 @@
     }
 
     public void newPool() {
-     //   previous = current;
+        previous = current;
         current = new ConstantMap(current.factory, current.name);
      //   previous =  new ConstantMap(); // disable cache
     }