diff -r c40a28e54185 -r a9ab35a0f5cb src/share/vm/runtime/fprofiler.cpp
--- a/src/share/vm/runtime/fprofiler.cpp	Tue Jan 08 04:05:41 2019 +0000
+++ b/src/share/vm/runtime/fprofiler.cpp	Tue Jan 08 04:55:25 2019 +0000
@@ -775,7 +775,7 @@
 }
 
 void ThreadProfiler::vm_update(TickPosition where) {
-  vm_update(NULL, where);
+  vm_update("", where);
 }
 
 void ThreadProfiler::vm_update(const char* name, TickPosition where) {