diff --git a/wchat/common/HttpClient.php b/wchat/common/HttpClient.php
index af01af6..213652b 100644
--- a/wchat/common/HttpClient.php
+++ b/wchat/common/HttpClient.php
@@ -681,7 +681,7 @@ class HttpClient
 			curl_setopt($ch, CURLOPT_POST, 1);
 		}
 		if ($this->method == self::GET || !empty($this->_data)) {
-			curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
+			curl_setopt($ch, CURLOPT_POSTFIELDS, $this->_data);
 		} else {
 			curl_setopt($ch, CURLOPT_POSTFIELDS, $this->mergeParams($data));
 		}