Fix DB.php

Hello! In this file i fixed bug with new and left chat participant.

src/DB.php

@@ -480,24 +480,19 @@ class DB
         } else {
             $forward_from = null;
         }
-
-        //Insert the new chat user
-        if (is_object($new_chat_participant)) {
+        
+        if ($new_chat_participant) {
+            //Insert the new chat user  
             self::insertUser($new_chat_participant, $date, $chat);
             $new_chat_participant = $new_chat_participant->getId();
-        } else {
-            $new_chat_participant = '';
-        }
-
-        //Insert the left chat user
-        if (is_object($left_chat_participant)) {
+        } elseif($left_chat_participant) {
+            //Insert the left chat user
             self::insertUser($left_chat_participant, $date, $chat);
             $left_chat_participant = $left_chat_participant->getId();
-        } else {
-            $left_chat_participant = '';
         }
 
 
+
         try {
             //Messages Table
             $sth = self::$pdo->prepare('INSERT IGNORE INTO `'.TB_MESSAGE.'`
@@ -576,8 +571,8 @@ class DB
             $sth->bindParam(':caption', $caption, \PDO::PARAM_STR);
             $sth->bindParam(':contact', $contact, \PDO::PARAM_STR);
             $sth->bindParam(':location', $location, \PDO::PARAM_STR);
-            $sth->bindParam(':new_chat_participant', $new_chat_paticipant, \PDO::PARAM_INT);
-            $sth->bindParam(':left_chat_participant', $left_chat_paticipant, \PDO::PARAM_INT);
+            $sth->bindParam(':new_chat_participant', $new_chat_participant, \PDO::PARAM_INT);
+            $sth->bindParam(':left_chat_participant', $left_chat_participant, \PDO::PARAM_INT);
             $sth->bindParam(':new_chat_title', $new_chat_title, \PDO::PARAM_STR);
 
             //Array of Photosize