diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index d49f024e431..513b2d933f8 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -4458,6 +4458,9 @@ readtup_datum(Tuplesortstate *state, SortTuple *stup,
 static void
 free_sort_tuple(Tuplesortstate *state, SortTuple *stup)
 {
-	FREEMEM(state, GetMemoryChunkSpace(stup->tuple));
-	pfree(stup->tuple);
+	if (stup->tuple)
+	{
+		FREEMEM(state, GetMemoryChunkSpace(stup->tuple));
+		pfree(stup->tuple);
+	}
 }