diff --git a/src/backend/executor/nodeAgg.c src/backend/executor/nodeAgg.c
index 7ca74ad58d3..523217126ef 100644
--- a/src/backend/executor/nodeAgg.c
+++ src/backend/executor/nodeAgg.c
@@ -644,7 +644,7 @@ advance_transition_function(AggState *aggstate,
 								   pertrans->transtypeByVal,
 								   pertrans->transtypeLen);
 		}
-		if (!pergroupstate->transValueIsNull)
+		if (!(pergroupstate->noTransValue || pergroupstate->transValueIsNull))
 		{
 			if (DatumIsReadWriteExpandedObject(pergroupstate->transValue,
 											   false,