diff --git a/src/gausskernel/runtime/executor/nodeModifyTable.cpp b/src/gausskernel/runtime/executor/nodeModifyTable.cpp
index aac3bf0b3..2e9fe8fef 100644
--- a/src/gausskernel/runtime/executor/nodeModifyTable.cpp
+++ b/src/gausskernel/runtime/executor/nodeModifyTable.cpp
@@ -2431,11 +2431,11 @@ lreplace:
                 bool need_create_file = false;
                 int seqNum = -1;
                 bool can_ignore = estate->es_plannedstmt->hasIgnore;
-                if (!partKeyUpdate) {
+                Datum newval = ComputePartKeyExprTuple(result_relation_desc, estate, slot, NULL);
+                if (!newval && !partKeyUpdate) {
                     row_movement = false;
                     new_partId = oldPartitionOid;
                 } else {
-                    Datum newval = ComputePartKeyExprTuple(result_relation_desc, estate, slot, NULL);
                     if (newval) {
                         partitionRoutingForTuple(result_relation_desc, (void*)newval, u_sess->exec_cxt.route, can_ignore);
                     } else {
diff --git a/src/test/regress/input/partition_expr_key.source b/src/test/regress/input/partition_expr_key.source
index 79becca17..711adbbce 100644
--- a/src/test/regress/input/partition_expr_key.source
+++ b/src/test/regress/input/partition_expr_key.source
@@ -199,6 +199,22 @@ insert into b_bug_1 values(100,1.5),(199,2.5);
 select * from b_bug_1 partition(p1);
 select * from b_bug_1 partition(p2);
 drop table if exists b_bug_1;
+create table b_bug_2(a int, b int, c int) partition by range(a-b)
+(
+	partition p1 values less than(10),
+	partition p2 values less than(20),
+	partition p3 values less than(30)
+);
+create index on b_bug_2(a) global;
+create index on b_bug_2(b) local;
+insert into b_bug_2 values(19,10,1),(30,20,2),(50,30,3);
+select * from b_bug_2 partition(p1);
+select * from b_bug_2 partition(p2);
+select * from b_bug_2 partition(p3);
+update b_bug_2 set b = 21 where c = 2;
+select * from b_bug_2 partition(p1);
+select * from b_bug_2 partition(p2);
+select * from b_bug_2 partition(p3);
 
 
 --test pg_get_tabledef and pg_dump
diff --git a/src/test/regress/output/partition_expr_key.source b/src/test/regress/output/partition_expr_key.source
index 2b2c05f8b..648b914ee 100644
--- a/src/test/regress/output/partition_expr_key.source
+++ b/src/test/regress/output/partition_expr_key.source
@@ -558,6 +558,52 @@ select * from b_bug_1 partition(p2);
 (1 row)
 
 drop table if exists b_bug_1;
+create table b_bug_2(a int, b int, c int) partition by range(a-b)
+(
+	partition p1 values less than(10),
+	partition p2 values less than(20),
+	partition p3 values less than(30)
+);
+create index on b_bug_2(a) global;
+create index on b_bug_2(b) local;
+insert into b_bug_2 values(19,10,1),(30,20,2),(50,30,3);
+select * from b_bug_2 partition(p1);
+ a  | b  | c 
+----+----+---
+ 19 | 10 | 1
+(1 row)
+
+select * from b_bug_2 partition(p2);
+ a  | b  | c 
+----+----+---
+ 30 | 20 | 2
+(1 row)
+
+select * from b_bug_2 partition(p3);
+ a  | b  | c 
+----+----+---
+ 50 | 30 | 3
+(1 row)
+
+update b_bug_2 set b = 21 where c = 2;
+select * from b_bug_2 partition(p1);
+ a  | b  | c 
+----+----+---
+ 19 | 10 | 1
+ 30 | 21 | 2
+(2 rows)
+
+select * from b_bug_2 partition(p2);
+ a | b | c 
+---+---+---
+(0 rows)
+
+select * from b_bug_2 partition(p3);
+ a  | b  | c 
+----+----+---
+ 50 | 30 | 3
+(1 row)
+
 --test pg_get_tabledef and pg_dump
 create table testnormalsubpart(a int, b int) partition by range(a) subpartition by range(b)
 (