diff --git a/README.md b/README.md
index 0ef70c1..771e9a1 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 ![GitHub Actions Workflow Status](https://img.shields.io/github/actions/workflow/status/mobizt/FirebaseClient/.github%2Fworkflows%2Fcompile_library.yml?logo=github&label=compile) [![Github Stars](https://img.shields.io/github/stars/mobizt/FirebaseClient?logo=github)](https://github.com/mobizt/FirebaseClient/stargazers) ![Github Issues](https://img.shields.io/github/issues/mobizt/FirebaseClient?logo=github)
 
-![GitHub Release](https://img.shields.io/github/v/release/mobizt/FirebaseClient) ![Arduino](https://img.shields.io/badge/Arduino-v1.2.18-57C207?logo=arduino) ![PlatformIO](https://badges.registry.platformio.org/packages/mobizt/library/FirebaseClient.svg) ![GitHub Release Date](https://img.shields.io/github/release-date/mobizt/FirebaseClient)
+![GitHub Release](https://img.shields.io/github/v/release/mobizt/FirebaseClient) ![Arduino](https://img.shields.io/badge/Arduino-v1.2.19-57C207?logo=arduino) ![PlatformIO](https://badges.registry.platformio.org/packages/mobizt/library/FirebaseClient.svg) ![GitHub Release Date](https://img.shields.io/github/release-date/mobizt/FirebaseClient)
 
 [![GitHub Sponsors](https://img.shields.io/github/sponsors/mobizt?logo=github)](https://github.com/sponsors/mobizt)
 
diff --git a/library.json b/library.json
index 8459e18..3019042 100644
--- a/library.json
+++ b/library.json
@@ -1,6 +1,6 @@
 {
   "name": "FirebaseClient",
-  "version": "1.2.18",
+  "version": "1.2.19",
   "keywords": "communication, REST, esp32, esp8266, arduino",
   "description": "Async Firebase Client library for Arduino.",
   "repository": {
diff --git a/library.properties b/library.properties
index e744aa2..7558217 100644
--- a/library.properties
+++ b/library.properties
@@ -1,6 +1,6 @@
 name=FirebaseClient
 
-version=1.2.18
+version=1.2.19
 
 author=Mobizt
 
diff --git a/src/core/Core.h b/src/core/Core.h
index fc6243a..4843881 100644
--- a/src/core/Core.h
+++ b/src/core/Core.h
@@ -7,7 +7,7 @@
 #undef FIREBASE_CLIENT_VERSION
 #endif
 
-#define FIREBASE_CLIENT_VERSION "1.2.18"
+#define FIREBASE_CLIENT_VERSION "1.2.19"
 
 static void sys_idle()
 {
diff --git a/src/firestore/Values.h b/src/firestore/Values.h
index f6a3fb1..9cb772d 100644
--- a/src/firestore/Values.h
+++ b/src/firestore/Values.h
@@ -1,5 +1,5 @@
 /**
- * Created June 22, 2024
+ * Created June 26, 2024
  *
  * The MIT License (MIT)
  * Copyright (c) 2024 K. Suwatchai (Mobizt)
@@ -328,27 +328,9 @@ namespace Values
         ObjectWriter owriter;
         bool flags[11];
 
-        template <typename T>
-        bool isExisted(T value)
-        {
-            String tmp = value.val();
-            for (size_t i = 0; i <= firestore_const_key_mapValue; i++)
-            {
-                if (tmp.indexOf(firestore_const_key[i].text) > -1)
-                {
-                    if (flags[i])
-                        return true;
-                    flags[i] = 1;
-                }
-            }
-
-            return false;
-        }
         template <typename T>
         void set(T value)
         {
-            if (isExisted(value))
-                return;
             owriter.setPair(buf, FPSTR("values"), value.val(), true);
         }
 
@@ -375,14 +357,11 @@ namespace Values
         template <typename T>
         ArrayValue &add(T value)
         {
-            if (!isExisted(value))
-            {
-                if (buf.length() == 0)
-                    set(value);
-                else
-                    owriter.addMember(buf, value.val(), false, "]}");
-                getVal();
-            }
+            if (buf.length() == 0)
+                set(value);
+            else
+                owriter.addMember(buf, value.val(), false, "]}");
+            getVal();
             return *this;
         }
         const char *c_str() const { return buf.c_str(); }