--- a/src/hotspot/share/jfr/instrumentation/jfrEventClassTransformer.cpp	Fri Nov 23 13:16:45 2018 +0530
+++ b/src/hotspot/share/jfr/instrumentation/jfrEventClassTransformer.cpp	Fri Nov 23 10:51:59 2018 +0100
@@ -447,6 +447,7 @@
   if (registered_symbol == NULL) {
     registered_symbol = SymbolTable::lookup_only(registered_constant, sizeof registered_constant - 1, unused_hash);
     if (registered_symbol == NULL) {
+      untypedEventHandler = true;
       return false;
     }
   }