diff --git a/src/backend/executor/execExprInterp.c b/src/backend/executor/execExprInterp.c
index 034970648f3..3b5333716d4 100644
--- a/src/backend/executor/execExprInterp.c
+++ b/src/backend/executor/execExprInterp.c
@@ -1743,7 +1743,8 @@ ExecInterpExpr(ExprState *state, ExprContext *econtext, bool *isnull)
 			 * expanded object that is already a child of the aggcontext,
 			 * assume we can adopt that value without copying it.
 			 */
-			if (DatumGetPointer(newVal) != DatumGetPointer(pergroup->transValue))
+			if (DatumGetPointer(newVal) != DatumGetPointer(pergroup->transValue) ||
+				fcinfo->isnull != pergroup->transValueIsNull)
 				newVal = ExecAggTransReparent(aggstate, pertrans,
 											  newVal, fcinfo->isnull,
 											  pergroup->transValue,
diff --git a/src/backend/executor/nodeAgg.c b/src/backend/executor/nodeAgg.c
index 6ee24eab3d2..e848853d6fd 100644
--- a/src/backend/executor/nodeAgg.c
+++ b/src/backend/executor/nodeAgg.c
@@ -628,7 +628,8 @@ advance_transition_function(AggState *aggstate,
 	 * aggcontext, assume we can adopt that value without copying it.
 	 */
 	if (!pertrans->transtypeByVal &&
-		DatumGetPointer(newVal) != DatumGetPointer(pergroupstate->transValue))
+		(DatumGetPointer(newVal) != DatumGetPointer(pergroupstate->transValue) ||
+		 fcinfo->isnull != pergroupstate->transValueIsNull))
 	{
 		if (!fcinfo->isnull)
 		{
diff --git a/src/backend/executor/nodeWindowAgg.c b/src/backend/executor/nodeWindowAgg.c
index f1b9407840d..b165f334c09 100644
--- a/src/backend/executor/nodeWindowAgg.c
+++ b/src/backend/executor/nodeWindowAgg.c
@@ -370,7 +370,8 @@ advance_windowaggregate(WindowAggState *winstate,
 	 * aggcontext, assume we can adopt that value without copying it.
 	 */
 	if (!peraggstate->transtypeByVal &&
-		DatumGetPointer(newVal) != DatumGetPointer(peraggstate->transValue))
+		(DatumGetPointer(newVal) != DatumGetPointer(peraggstate->transValue) ||
+		 fcinfo->isnull != peraggstate->transValueIsNull))
 	{
 		if (!fcinfo->isnull)
 		{
diff --git a/src/backend/jit/llvm/llvmjit_expr.c b/src/backend/jit/llvm/llvmjit_expr.c
index ffd887c71aa..f202f25d1d3 100644
--- a/src/backend/jit/llvm/llvmjit_expr.c
+++ b/src/backend/jit/llvm/llvmjit_expr.c
@@ -2369,13 +2369,19 @@ llvm_compile_expr(ExprState *state)
 						v_transnull = LLVMBuildLoad(b, v_transnullp, "");
 
 						/*
+						 * fcinfo->isnull != pergroup->transValueIsNull ||
 						 * DatumGetPointer(newVal) !=
 						 * DatumGetPointer(pergroup->transValue))
 						 */
 						LLVMBuildCondBr(b,
-										LLVMBuildICmp(b, LLVMIntEQ,
-													  v_transvalue,
-													  v_retval, ""),
+										LLVMBuildAnd(b,
+													 LLVMBuildICmp(b, LLVMIntEQ,
+																   v_transnull,
+																   v_fcinfo_isnull, ""),
+													 LLVMBuildICmp(b, LLVMIntEQ,
+																   v_transvalue,
+																   v_retval, ""),
+													 ""),
 										b_nocall, b_call);
 
 						/* returned datum not passed datum, reparent */