diff --git a/tdlib.c b/tdlib.c
index 06685b4..6fa2e40 100644
--- a/tdlib.c
+++ b/tdlib.c
@@ -3,6 +3,7 @@
 #endif
 
 #include "php.h"
+#include "zend_smart_str.h"
 #include "php_tdlib.h"
 #include "ext/json/php_json.h"
 #include "zend_exceptions.h"
@@ -159,7 +160,7 @@ PHP_METHOD (TdLib, receive) {
     void *tdClient = tdlib_client_get_instance(getThis());
     double timeout;
 
-    ZEND_PARSE_PARAMETERS_START(0, 1)
+    ZEND_PARSE_PARAMETERS_START(1, 1)
             Z_PARAM_DOUBLE(timeout);
     ZEND_PARSE_PARAMETERS_END();
 
@@ -190,6 +191,7 @@ PHP_METHOD (TdLib, send) {
 
     if (tdClient) {
         php_json_encode(&buf, parameter, 0);
+        smart_str_0(&buf);
 
         td_json_client_send(tdClient, ZSTR_VAL(buf.s));
     }
@@ -205,6 +207,7 @@ PHP_METHOD (TdLib, execute) {
 
 
     php_json_encode(&buf, parameter, 0);
+    smart_str_0(&buf);
 
     const char *response = td_json_client_execute(NULL, ZSTR_VAL(buf.s));