feature #1483: Prevents deleting of NULL pointer

src/scheduler/src/sched/Scheduler.cc

@@ -661,7 +661,10 @@ int Scheduler::do_scheduled_actions()
 
             if (vatt == 0)
             {
-                delete *it;
+                if ( *it != 0 )
+                {
+                    delete *it;
+                }
 
                 continue;
             }