diff --git a/v1/client_test.go b/v1/client_test.go
index 679bb08..b4ab042 100644
--- a/v1/client_test.go
+++ b/v1/client_test.go
@@ -679,10 +679,21 @@ func (t *MGClientTest) Test_UploadFile() {
 	t.Assert().Equal(resp, data)
 }
 
-func (t *MGClientTest) Test_SuccessHandleError() {
+func (t *MGClientTest) Test_SuccessHandleAPIError() {
 	client := t.client()
 	handleError := client.Error([]byte(`{"errors": ["Channel not found"]}`))
 
 	t.Assert().IsType(APIError(""), handleError)
 	t.Assert().Equal(handleError.Error(), "Channel not found")
+
+	defer gock.Off()
+	t.gock().
+		Delete(t.transportURL("channels/123")).
+		Reply(http.StatusInternalServerError)
+
+	_, statusCode, err := client.DeactivateTransportChannel(123)
+
+	t.Assert().Equal(http.StatusInternalServerError, statusCode)
+	t.Assert().IsType(APIError(""), err)
+	t.Assert().Equal("http request error. status code: 500", err.Error())
 }
diff --git a/v1/request.go b/v1/request.go
index 82fc545..9941291 100644
--- a/v1/request.go
+++ b/v1/request.go
@@ -71,11 +71,11 @@ func makeRequest(reqType, url string, buf io.Reader, c *MgClient) ([]byte, int,
 
 	resp, err := c.httpClient.Do(req)
 	if err != nil {
-		return res, 0, err
+		return res, 0, ClientError(err.Error())
 	}
 
 	if resp.StatusCode >= http.StatusInternalServerError {
-		err = fmt.Errorf("http request error. status code: %d", resp.StatusCode)
+		err = APIError(fmt.Sprintf("http request error. status code: %d", resp.StatusCode))
 		return res, resp.StatusCode, err
 	}
 
diff --git a/v1/types.go b/v1/types.go
index 7492361..9504b23 100644
--- a/v1/types.go
+++ b/v1/types.go
@@ -66,6 +66,14 @@ const (
 	OriginatorChannel
 )
 
+// ClientError is error of http-client or network.
+type ClientError string
+
+func (err ClientError) Error() string {
+	return string(err)
+}
+
+// APIError is error from MG.
 type APIError string
 
 func (err APIError) Error() string {