diff --git a/vngcloud/sdk_error/common.go b/vngcloud/sdk_error/common.go
index 7b76624..4b63711 100644
--- a/vngcloud/sdk_error/common.go
+++ b/vngcloud/sdk_error/common.go
@@ -10,6 +10,7 @@ import (
 const (
 	patternOutOfPoc      = "you do not have sufficient credits to complete the purchase"
 	patternPagingInvalid = "page or size invalid"
+	patternTagKeyInvalid = "the value for the tag key contains illegal characters"
 )
 
 func ErrorHandler(perr error, popts ...func(psdkErr IError)) IError {
@@ -95,6 +96,21 @@ func WithErrorOutOfPoc(perrResp IErrorRespone) func(sdkError IError) {
 	}
 }
 
+func WithErrorTagKeyInvalid(perrResp IErrorRespone) func(sdkError IError) {
+	return func(sdkError IError) {
+		if perrResp == nil {
+			return
+		}
+
+		errMsg := perrResp.GetMessage()
+		if lstr.Contains(lstr.ToLower(lstr.TrimSpace(errMsg)), patternTagKeyInvalid) {
+			sdkError.WithErrorCode(EcTagKeyInvalid).
+				WithMessage(errMsg).
+				WithErrors(perrResp.GetError())
+		}
+	}
+}
+
 func WithErrorPagingInvalid(perrResp IErrorRespone) func(sdkError IError) {
 	return func(sdkError IError) {
 		if perrResp == nil {
diff --git a/vngcloud/sdk_error/error_codes.go b/vngcloud/sdk_error/error_codes.go
index 8649abc..c614175 100644
--- a/vngcloud/sdk_error/error_codes.go
+++ b/vngcloud/sdk_error/error_codes.go
@@ -8,6 +8,7 @@ const (
 	EcInternalServerError = ErrorCode("VngCloudApiInternalServerError")
 	EcServiceMaintenance  = ErrorCode("VngCloudServiceMaintenance")
 	EcPagingInvalid       = ErrorCode("VngCloudApiPagingInvalid")
+	EcTagKeyInvalid       = ErrorCode("VngCloudApiTagKeyInvalid")
 	EcPermissionDenied    = ErrorCode("VngCloudApiPermissionDenied")
 	EcUnexpectedError     = ErrorCode("VngCloudApiUnexpectedError")
 )
diff --git a/vngcloud/services/loadbalancer/v2/irequest.go b/vngcloud/services/loadbalancer/v2/irequest.go
index ab54624..42c4949 100644
--- a/vngcloud/services/loadbalancer/v2/irequest.go
+++ b/vngcloud/services/loadbalancer/v2/irequest.go
@@ -142,4 +142,5 @@ type IUpdateTagsRequest interface {
 	ToRequestBody(plstTags *lsentity.ListTags) interface{}
 	ParseUserAgent() string
 	WithTags(ptags ...string) IUpdateTagsRequest
+	ToMap() map[string]interface{}
 }
diff --git a/vngcloud/services/loadbalancer/v2/tag.go b/vngcloud/services/loadbalancer/v2/tag.go
index 5b7f524..fe1834f 100644
--- a/vngcloud/services/loadbalancer/v2/tag.go
+++ b/vngcloud/services/loadbalancer/v2/tag.go
@@ -62,7 +62,8 @@ func (s *LoadBalancerServiceV2) UpdateTags(popts IUpdateTagsRequest) lserr.IErro
 		WithJsonError(errResp)
 
 	if _, sdkErr = s.VServerClient.Put(url, req); sdkErr != nil {
-		return lserr.SdkErrorHandler(sdkErr, errResp)
+		return lserr.SdkErrorHandler(sdkErr, errResp,
+			lserr.WithErrorTagKeyInvalid(errResp)).WithParameters(popts.ToMap())
 	}
 
 	return nil
diff --git a/vngcloud/services/loadbalancer/v2/tag_request.go b/vngcloud/services/loadbalancer/v2/tag_request.go
index 6a43ffa..1e026d5 100644
--- a/vngcloud/services/loadbalancer/v2/tag_request.go
+++ b/vngcloud/services/loadbalancer/v2/tag_request.go
@@ -102,3 +102,11 @@ func (s *UpdateTagsRequest) WithTags(ptags ...string) IUpdateTagsRequest {
 
 	return s
 }
+
+func (s *UpdateTagsRequest) ToMap() map[string]interface{} {
+	res := make(map[string]interface{})
+	for _, tag := range s.TagRequestList {
+		res[tag.Key] = tag.Value
+	}
+	return res
+}