diff --git a/wchat/common/HttpClient.php b/wchat/common/HttpClient.php
index e313211..3e59a37 100644
--- a/wchat/common/HttpClient.php
+++ b/wchat/common/HttpClient.php
@@ -546,11 +546,8 @@ class HttpClient
 	 */
 	private function toRequest($data)
 	{
-		if (!is_array($data)) {
-			$data = Help::toArray($data);
-			if (is_string($data)) {
-				return $data;
-			}
+		if (is_string($data)) {
+			return $data;
 		}
 
 		$contentType = 'application/x-www-form-urlencoded';