diff --git a/include/util/taoserror.h b/include/util/taoserror.h
index d16a599811..0058b03b30 100644
--- a/include/util/taoserror.h
+++ b/include/util/taoserror.h
@@ -577,6 +577,7 @@ int32_t* taosGetErrno();
 #define TSDB_CODE_FUNC_FUNTION_PARA_TYPE        TAOS_DEF_ERROR_CODE(0, 0x2802)
 #define TSDB_CODE_FUNC_FUNTION_PARA_VALUE       TAOS_DEF_ERROR_CODE(0, 0x2803)
 #define TSDB_CODE_FUNC_NOT_BUILTIN_FUNTION      TAOS_DEF_ERROR_CODE(0, 0x2804)
+#define TSDB_CODE_FUNC_DUP_TIMESTAMP            TAOS_DEF_ERROR_CODE(0, 0x012B)
 
 //udf
 #define TSDB_CODE_UDF_STOPPING                  TAOS_DEF_ERROR_CODE(0, 0x2901)
diff --git a/source/libs/function/src/builtinsimpl.c b/source/libs/function/src/builtinsimpl.c
index 35e3e07839..7d8c231c15 100644
--- a/source/libs/function/src/builtinsimpl.c
+++ b/source/libs/function/src/builtinsimpl.c
@@ -5447,8 +5447,7 @@ int32_t twaFunction(SqlFunctionCtx* pCtx) {
         numOfElems++;
 
         if (pInfo->p.key == st.key) {
-          numOfElems = 0;
-          goto _twa_over;
+          return TSDB_CODE_FUNC_DUP_TIMESTAMP;
         }
 
         INIT_INTP_POINT(st, tsList[i], val[i]);
@@ -5467,8 +5466,7 @@ int32_t twaFunction(SqlFunctionCtx* pCtx) {
         numOfElems++;
 
         if (pInfo->p.key == st.key) {
-          numOfElems = 0;
-          goto _twa_over;
+          return TSDB_CODE_FUNC_DUP_TIMESTAMP;
         }
 
         INIT_INTP_POINT(st, tsList[i], val[i]);
@@ -5486,8 +5484,7 @@ int32_t twaFunction(SqlFunctionCtx* pCtx) {
         numOfElems++;
 
         if (pInfo->p.key == st.key) {
-          numOfElems = 0;
-          goto _twa_over;
+          return TSDB_CODE_FUNC_DUP_TIMESTAMP;
         }
 
         INIT_INTP_POINT(st, tsList[i], val[i]);
@@ -5505,8 +5502,7 @@ int32_t twaFunction(SqlFunctionCtx* pCtx) {
         numOfElems++;
 
         if (pInfo->p.key == st.key) {
-          numOfElems = 0;
-          goto _twa_over;
+          return TSDB_CODE_FUNC_DUP_TIMESTAMP;
         }
 
         INIT_INTP_POINT(st, tsList[i], val[i]);
@@ -5524,8 +5520,7 @@ int32_t twaFunction(SqlFunctionCtx* pCtx) {
         numOfElems++;
 
         if (pInfo->p.key == st.key) {
-          numOfElems = 0;
-          goto _twa_over;
+          return TSDB_CODE_FUNC_DUP_TIMESTAMP;
         }
 
         INIT_INTP_POINT(st, tsList[i], val[i]);
@@ -5543,8 +5538,7 @@ int32_t twaFunction(SqlFunctionCtx* pCtx) {
         numOfElems++;
 
         if (pInfo->p.key == st.key) {
-          numOfElems = 0;
-          goto _twa_over;
+          return TSDB_CODE_FUNC_DUP_TIMESTAMP;
         }
 
         INIT_INTP_POINT(st, tsList[i], val[i]);
@@ -5562,8 +5556,7 @@ int32_t twaFunction(SqlFunctionCtx* pCtx) {
         numOfElems++;
 
         if (pInfo->p.key == st.key) {
-          numOfElems = 0;
-          goto _twa_over;
+          return TSDB_CODE_FUNC_DUP_TIMESTAMP;
         }
 
         INIT_INTP_POINT(st, tsList[i], val[i]);
@@ -5581,8 +5574,7 @@ int32_t twaFunction(SqlFunctionCtx* pCtx) {
         numOfElems++;
 
         if (pInfo->p.key == st.key) {
-          numOfElems = 0;
-          goto _twa_over;
+          return TSDB_CODE_FUNC_DUP_TIMESTAMP;
         }
 
         INIT_INTP_POINT(st, tsList[i], val[i]);
@@ -5600,8 +5592,7 @@ int32_t twaFunction(SqlFunctionCtx* pCtx) {
         numOfElems++;
 
         if (pInfo->p.key == st.key) {
-          numOfElems = 0;
-          goto _twa_over;
+          return TSDB_CODE_FUNC_DUP_TIMESTAMP;
         }
 
         INIT_INTP_POINT(st, tsList[i], val[i]);
@@ -5619,8 +5610,7 @@ int32_t twaFunction(SqlFunctionCtx* pCtx) {
         numOfElems++;
 
         if (pInfo->p.key == st.key) {
-          numOfElems = 0;
-          goto _twa_over;
+          return TSDB_CODE_FUNC_DUP_TIMESTAMP;
         }
 
         INIT_INTP_POINT(st, tsList[i], val[i]);
diff --git a/source/util/src/terror.c b/source/util/src/terror.c
index 044cdc86b4..ab0771d218 100644
--- a/source/util/src/terror.c
+++ b/source/util/src/terror.c
@@ -579,6 +579,7 @@ TAOS_DEFINE_ERROR(TSDB_CODE_FUNC_FUNTION_PARA_NUM,         "Invalid function par
 TAOS_DEFINE_ERROR(TSDB_CODE_FUNC_FUNTION_PARA_TYPE,        "Invalid function para type")
 TAOS_DEFINE_ERROR(TSDB_CODE_FUNC_FUNTION_PARA_VALUE,       "Invalid function para value")
 TAOS_DEFINE_ERROR(TSDB_CODE_FUNC_NOT_BUILTIN_FUNTION,      "Not buildin function")
+TAOS_DEFINE_ERROR(TSDB_CODE_FUNC_DUP_TIMESTAMP,            "Duplicate timestamps not allowed in function")
 
 //udf
 TAOS_DEFINE_ERROR(TSDB_CODE_UDF_STOPPING,                   "udf is stopping")