Index: src/kmp_tasking.c
===================================================================
--- src/kmp_tasking.c
+++ src/kmp_tasking.c
@@ -578,7 +578,8 @@
 {
     // Proxy tasks must always be allowed to free their parents
     // because they can be run in background even in serial mode.
-    kmp_int32 task_serial = taskdata->td_flags.task_serial && !taskdata->td_flags.proxy;
+    kmp_int32 team_serial = ( taskdata->td_flags.team_serial ||
+        taskdata->td_flags.tasking_ser ) && !taskdata->td_flags.proxy;
     KMP_DEBUG_ASSERT( taskdata -> td_flags.tasktype == TASK_EXPLICIT );
 
     kmp_int32 children = KMP_TEST_THEN_DEC32( (kmp_int32 *)(& taskdata -> td_allocated_child_tasks) ) - 1;
@@ -599,7 +600,7 @@
 
         // Stop checking ancestors at implicit task
         // instead of walking up ancestor tree to avoid premature deallocation of ancestors.
-        if ( task_serial || taskdata -> td_flags.tasktype == TASK_IMPLICIT )
+        if ( team_serial || taskdata -> td_flags.tasktype == TASK_IMPLICIT )
             return;
 
         // Predecrement simulated by "- 1" calculation