diff a/src/hotspot/share/gc/shared/workgroup.cpp b/src/hotspot/share/gc/shared/workgroup.cpp
--- a/src/hotspot/share/gc/shared/workgroup.cpp
+++ b/src/hotspot/share/gc/shared/workgroup.cpp
@@ -452,11 +452,11 @@
   }
 }
 
 
 SubTasksDone::~SubTasksDone() {
-  if (_tasks != NULL) FREE_C_HEAP_ARRAY(uint, _tasks);
+  FREE_C_HEAP_ARRAY(uint, _tasks);
 }
 
 // *** SequentialSubTasksDone
 
 void SequentialSubTasksDone::clear() {