diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index 147889177fa..015c197a77f 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -4827,6 +4827,9 @@ movetup_datum(void *dest, void *src, unsigned int len)
 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);
+	}
 }