diff --git a/library/src/main/java/com/pengrad/telegrambot/model/Birthdate.java b/library/src/main/java/com/pengrad/telegrambot/model/Birthdate.java
index 96d63670..fc43482a 100644
--- a/library/src/main/java/com/pengrad/telegrambot/model/Birthdate.java
+++ b/library/src/main/java/com/pengrad/telegrambot/model/Birthdate.java
@@ -26,11 +26,9 @@ public Integer year() {
     @Override
     public boolean equals(Object o) {
         if (this == o) return true;
-        if (!(o instanceof Birthdate)) return false;
+        if (o == null || getClass() != o.getClass()) return false;
         Birthdate birthdate = (Birthdate) o;
-        return Objects.equals(day, birthdate.day)
-            && Objects.equals(month, birthdate.month)
-            && Objects.equals(year, birthdate.year);
+        return Objects.equals(day, birthdate.day) && Objects.equals(month, birthdate.month) && Objects.equals(year, birthdate.year);
     }
 
     @Override
@@ -41,9 +39,9 @@ public int hashCode() {
     @Override
     public String toString() {
         return "Birthday{" +
-            "day=" + day +
-            ", month=" + month +
-            ", year=" + year +
-            '}';
+                "day=" + day +
+                ", month=" + month +
+                ", year=" + year +
+                '}';
     }
 }
diff --git a/library/src/main/java/com/pengrad/telegrambot/model/User.java b/library/src/main/java/com/pengrad/telegrambot/model/User.java
index ae7bfc6c..9aa5cecf 100644
--- a/library/src/main/java/com/pengrad/telegrambot/model/User.java
+++ b/library/src/main/java/com/pengrad/telegrambot/model/User.java
@@ -81,20 +81,9 @@ public Boolean canConnectToBusiness() {
     @Override
     public boolean equals(Object o) {
         if (this == o) return true;
-        if (!(o instanceof User)) return false;
+        if (o == null || getClass() != o.getClass()) return false;
         User user = (User) o;
-        return Objects.equals(id, user.id)
-            && Objects.equals(is_bot, user.is_bot)
-            && Objects.equals(first_name, user.first_name)
-            && Objects.equals(last_name, user.last_name)
-            && Objects.equals(username, user.username)
-            && Objects.equals(language_code, user.language_code)
-            && Objects.equals(is_premium, user.is_premium)
-            && Objects.equals(added_to_attachment_menu, user.added_to_attachment_menu)
-            && Objects.equals(can_join_groups, user.can_join_groups)
-            && Objects.equals(can_read_all_group_messages, user.can_read_all_group_messages)
-            && Objects.equals(supports_inline_queries, user.supports_inline_queries)
-            && Objects.equals(can_connect_to_business, user.can_connect_to_business);
+        return Objects.equals(id, user.id) && Objects.equals(is_bot, user.is_bot) && Objects.equals(first_name, user.first_name) && Objects.equals(last_name, user.last_name) && Objects.equals(username, user.username) && Objects.equals(language_code, user.language_code) && Objects.equals(is_premium, user.is_premium) && Objects.equals(added_to_attachment_menu, user.added_to_attachment_menu) && Objects.equals(can_join_groups, user.can_join_groups) && Objects.equals(can_read_all_group_messages, user.can_read_all_group_messages) && Objects.equals(supports_inline_queries, user.supports_inline_queries) && Objects.equals(can_connect_to_business, user.can_connect_to_business);
     }
 
     @Override
diff --git a/library/src/main/java/com/pengrad/telegrambot/model/UsersShared.java b/library/src/main/java/com/pengrad/telegrambot/model/UsersShared.java
index 241d55d7..6030f3a4 100644
--- a/library/src/main/java/com/pengrad/telegrambot/model/UsersShared.java
+++ b/library/src/main/java/com/pengrad/telegrambot/model/UsersShared.java
@@ -32,11 +32,9 @@ public Integer[] userIds() {
     @Override
     public boolean equals(Object o) {
         if (this == o) return true;
-        if (!(o instanceof UsersShared)) return false;
+        if (o == null || getClass() != o.getClass()) return false;
         UsersShared that = (UsersShared) o;
-        return Objects.equals(request_id, that.request_id)
-            && Arrays.equals(user_ids, that.user_ids)
-            && Arrays.equals(users, that.users);
+        return Objects.equals(request_id, that.request_id) && Arrays.equals(user_ids, that.user_ids) && Arrays.equals(users, that.users);
     }
 
     @Override
@@ -50,9 +48,9 @@ public int hashCode() {
     @Override
     public String toString() {
         return "UsersShared{" +
-            "request_id=" + request_id +
-            ", user_ids=" + Arrays.toString(user_ids) +
-            ", users=" + Arrays.toString(users) +
-            '}';
+                "request_id=" + request_id +
+                ", user_ids=" + Arrays.toString(user_ids) +
+                ", users=" + Arrays.toString(users) +
+                '}';
     }
 }
diff --git a/library/src/test/java/com/pengrad/telegrambot/ModelTest.java b/library/src/test/java/com/pengrad/telegrambot/ModelTest.java
index dfb9d71c..13735d50 100644
--- a/library/src/test/java/com/pengrad/telegrambot/ModelTest.java
+++ b/library/src/test/java/com/pengrad/telegrambot/ModelTest.java
@@ -72,12 +72,18 @@ public void testEquals() throws ReflectiveOperationException {
         f.setAccessible(true);
         f.set(update, 1);
 
+        Chat chat = new Chat();
+        f = Chat.class.getDeclaredField("id");
+        f.setAccessible(true);
+        f.set(chat, 1L);
+
         for (Class<?> c : classes) {
             EqualsVerifierApi<?> verifierApi = EqualsVerifier.forClass(c)
                     .usingGetClass()
                     .withPrefabValues(Update.class, Update.class.getDeclaredConstructor().newInstance(), update)
                     .withPrefabValues(Message.class, Message.class.getDeclaredConstructor().newInstance(), message)
                     .withPrefabValues(CallbackQuery.class, CallbackQuery.class.getDeclaredConstructor().newInstance(), callbackQuery)
+                    .withPrefabValues(Chat.class, new Chat(), chat)
                     .suppress(Warning.STRICT_HASHCODE)
                     .suppress(Warning.NONFINAL_FIELDS);