diff --git a/common/HttpClient.php b/common/HttpClient.php
index 2064396..b45c3a2 100644
--- a/common/HttpClient.php
+++ b/common/HttpClient.php
@@ -574,8 +574,13 @@ class HttpClient
 
 			return $result;
 		}
-		$result['code'] = $body[$this->errorCodeField] ?? 0;
-		$result['message'] = $body[$this->errorMsgField] ?? 'system success.';
+		if (is_string($body)) {
+			$result['code'] = 0;
+			$result['message'] = '';
+		} else {
+			$result['code'] = $body[$this->errorCodeField] ?? 0;
+			$result['message'] = $body[$this->errorMsgField] ?? 'system success.';
+		}
 		$result['data'] = $body;
 		$result['header'] = $header;
 		$result['httpStatus'] = $statusCode;