diff --git a/vngcloud/sdk_error/endpoint.go b/vngcloud/sdk_error/endpoint.go
index 285ffe5..267f74b 100644
--- a/vngcloud/sdk_error/endpoint.go
+++ b/vngcloud/sdk_error/endpoint.go
@@ -84,4 +84,18 @@ func WithErrorEndpointTagNotFound(perrResp IErrorRespone) func(sdkError IError)
 				WithErrors(perrResp.GetError())
 		}
 	}
+}
+
+func WithErrorEndpointTagExisted(perrResp IErrorRespone) func(sdkError IError) {
+	return func(sdkError IError) {
+		if perrResp == nil {
+			return
+		}
+
+		if lstr.ToUpper(lstr.TrimSpace(perrResp.GetError().Error())) == "TAG_EXISTED" {
+			sdkError.WithErrorCode(EcVNetworkEndpointTagExisted).
+				WithMessage(perrResp.GetMessage()).
+				WithErrors(perrResp.GetError())
+		}
+	}
 }
\ No newline at end of file
diff --git a/vngcloud/sdk_error/error_codes.go b/vngcloud/sdk_error/error_codes.go
index 1dcefa8..78049b6 100644
--- a/vngcloud/sdk_error/error_codes.go
+++ b/vngcloud/sdk_error/error_codes.go
@@ -154,4 +154,5 @@ const (
 	EcVNetworkContainInvalidCharacter                   = ErrorCode("ContainInvalidCharacter")
 	EcVNetworkLockOnProcess                             = ErrorCode("LockOnProcess")
 	EcVNetworkEndpointTagNotFound                       = ErrorCode("EndpointTagNotFound")
+	EcVNetworkEndpointTagExisted                        = ErrorCode("EndpointTagExisted")
 )
diff --git a/vngcloud/services/network/v1/endpoint.go b/vngcloud/services/network/v1/endpoint.go
index cb10678..c73489d 100644
--- a/vngcloud/services/network/v1/endpoint.go
+++ b/vngcloud/services/network/v1/endpoint.go
@@ -124,6 +124,7 @@ func (s *NetworkServiceInternalV1) CreateTagsWithEndpointId(popts ICreateTagsWit
 
 	if _, sdkErr := s.VNetworkClient.Post(url, req); sdkErr != nil {
 		return lserr.SdkErrorHandler(sdkErr, errResp,
+			lserr.WithErrorEndpointTagExisted(errResp),
 			lserr.WithErrorEndpointTagNotFound(errResp)).
 			WithKVparameters("projectId", s.getProjectId()).
 			WithParameters(popts.GetParameters())