diff --git a/src/client/src/tscAsync.c b/src/client/src/tscAsync.c
index 3f2a54fbdc144df7c4d5a32496ec87af0c632a5e..626762b3922e92b51afe6d7438d6830f3f3ba340 100644
--- a/src/client/src/tscAsync.c
+++ b/src/client/src/tscAsync.c
@@ -60,16 +60,22 @@ void doAsyncQuery(STscObj* pObj, SSqlObj* pSql, __async_cb_func_t fp, void* para
   tscDebugL("0x%"PRIx64" SQL: %s", pSql->self, pSql->sqlstr);
   pCmd->curSql = pSql->sqlstr;
 
+  taosAcquireRef(tscObjRef, pSql->self);
   int32_t code = tsParseSql(pSql, true);
-  if (code == TSDB_CODE_TSC_ACTION_IN_PROGRESS) return;
+  if (code == TSDB_CODE_TSC_ACTION_IN_PROGRESS) {
+    taosReleaseRef(tscObjRef, pSql->self);
+    return;
+  }
   
   if (code != TSDB_CODE_SUCCESS) {
     pSql->res.code = code;
     tscAsyncResultOnError(pSql);
+    taosReleaseRef(tscObjRef, pSql->self);
     return;
   }
 
   tscDoQuery(pSql);
+  taosReleaseRef(tscObjRef, pSql->self);
 }
 
 // TODO return the correct error code to client in tscQueueAsyncError
diff --git a/src/plugins/http/src/httpGcJson.c b/src/plugins/http/src/httpGcJson.c
index 8c223a15000d47becaf92fde34c92edb3f7ce707..397791706d0fc24f250c2332dddc5b0b031a4817 100644
--- a/src/plugins/http/src/httpGcJson.c
+++ b/src/plugins/http/src/httpGcJson.c
@@ -133,6 +133,16 @@ bool gcBuildQueryJson(HttpContext *pContext, HttpSqlCmd *cmd, TAOS_RES *result,
       int32_t len;
       len = snprintf(target, HTTP_GC_TARGET_SIZE, "%s{", aliasBuffer);
       for (int32_t i = dataFields + 1; i < num_fields; i++) {
+        if (row[i] == NULL) {
+          len += snprintf(target + len, HTTP_GC_TARGET_SIZE - len, "%s:nil", fields[i].name);
+
+          if (i < num_fields - 1) {
+            len += snprintf(target + len, HTTP_GC_TARGET_SIZE - len, ", ");
+          }
+
+          continue;
+        }
+
         switch (fields[i].type) {
           case TSDB_DATA_TYPE_BOOL:
           case TSDB_DATA_TYPE_TINYINT:
diff --git a/tests/pytest/crash_gen/valgrind_taos.supp b/tests/pytest/crash_gen/valgrind_taos.supp
index 344ad5dde5f9fc58b760691b94f112e9b458f1d7..403dcc0558089b7f9fe9916ac3661938b9468fbb 100644
--- a/tests/pytest/crash_gen/valgrind_taos.supp
+++ b/tests/pytest/crash_gen/valgrind_taos.supp
@@ -18177,4 +18177,41 @@
    fun:_PyEval_EvalFrameDefault
    obj:/usr/bin/python3.8
    fun:_PyEval_EvalFrameDefault
+}
+{
+   <insert_a_suppression_name_here>
+   Memcheck:Leak
+   match-leak-kinds: definite
+   fun:malloc
+   fun:_my_Py_InitModule
+   fun:b_init_cffi_1_0_external_module
+   obj:/usr/bin/python3.8
+   obj:/usr/bin/python3.8
+   fun:PyObject_CallMethod
+   fun:PyInit__openssl
+   fun:_PyImport_LoadDynamicModuleWithSpec
+   obj:/usr/bin/python3.8
+   obj:/usr/bin/python3.8
+   fun:PyVectorcall_Call
+   fun:_PyEval_EvalFrameDefault
+   fun:_PyEval_EvalCodeWithName
+}
+{
+   <insert_a_suppression_name_here>
+   Memcheck:Leak
+   match-leak-kinds: definite
+   fun:malloc
+   fun:_PyObject_GC_New
+   fun:ffi_internal_new
+   fun:b_init_cffi_1_0_external_module
+   obj:/usr/bin/python3.8
+   obj:/usr/bin/python3.8
+   fun:PyObject_CallMethod
+   fun:PyInit__constant_time
+   fun:_PyImport_LoadDynamicModuleWithSpec
+   obj:/usr/bin/python3.8
+   obj:/usr/bin/python3.8
+   fun:PyVectorcall_Call
+   fun:_PyEval_EvalFrameDefault
+
 }
\ No newline at end of file