diff --git a/contrib/shark/expected/test_dbcc.out b/contrib/shark/expected/test_dbcc.out
index 28b0b8df8a58f6e84ddb76c1b9dab5bcd239abb2..9555740f42d54e32eb42cf141f1d114f46bff702 100644
--- a/contrib/shark/expected/test_dbcc.out
+++ b/contrib/shark/expected/test_dbcc.out
@@ -114,6 +114,15 @@ CONTEXT:  referenced column: dbcc_check_ident_no_reseed
 DBCC CHECKIDENT ('employees_employeeid_seq', NORESEED); 
 ERROR:  relation "employees_employeeid_seq" does not exist
 CONTEXT:  referenced column: dbcc_check_ident_no_reseed
+drop table if exists Employees2;
+NOTICE:  table "employees2" does not exist, skipping
+create table Employees2(id int, name VARCHAR(100));
+insert into Employees2 values (1, 'zhangsan');
+insert into Employees2 values (2, 'lisi');
+DBCC CHECKIDENT ('Employees2', NORESEED);
+ERROR:  cannot not found the serial column for relation "Employees2"
+CONTEXT:  referenced column: dbcc_check_ident_no_reseed
+drop table if exists Employees2;
 -- plsql
 create or replace procedure test_procedure_test1(int)
 as
diff --git a/contrib/shark/sql/test_dbcc.sql b/contrib/shark/sql/test_dbcc.sql
index 9b3fcdb53951e88d85b32c1e5c414626c039834c..07c95d3f6ce2040d2ec7ec0e004d923cab5b77f6 100644
--- a/contrib/shark/sql/test_dbcc.sql
+++ b/contrib/shark/sql/test_dbcc.sql
@@ -63,6 +63,13 @@ DBCC CHECKIDENT ('Employees1', NORESEED);
 DBCC CHECKIDENT ('employees_employeeid_seq', NORESEED); 
 
 
+drop table if exists Employees2;
+create table Employees2(id int, name VARCHAR(100));
+insert into Employees2 values (1, 'zhangsan');
+insert into Employees2 values (2, 'lisi');
+DBCC CHECKIDENT ('Employees2', NORESEED);
+drop table if exists Employees2;
+
 -- plsql
 create or replace procedure test_procedure_test1(int)
 as
diff --git a/src/gausskernel/optimizer/commands/sequence/sequence.cpp b/src/gausskernel/optimizer/commands/sequence/sequence.cpp
index cf3cd52cb540fbd7a9e0fe99572d36bfdefd6931..d6554766a2c26f1912b776d226dfa339bcc8c80e 100644
--- a/src/gausskernel/optimizer/commands/sequence/sequence.cpp
+++ b/src/gausskernel/optimizer/commands/sequence/sequence.cpp
@@ -3179,7 +3179,7 @@ static inline void check_relation_valid(Relation rel, char* table_name)
         ereport(ERROR, (errcode(ERRCODE_UNDEFINED_TABLE), errmsg("relation \"%s\" does not exist", table_name)));
     }
 
-    if (rel->rd_att->constr->num_defval < 1) {
+    if (rel->rd_att->constr == NULL || rel->rd_att->constr->num_defval < 1) {
         relation_close(rel, AccessShareLock);
         ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                 errmsg("cannot not found the serial column for relation \"%s\"", table_name)));