diff --git a/LichessClientTG_bot/bot.py b/LichessClientTG_bot/bot.py
index 67d3c92..e91c763 100644
--- a/LichessClientTG_bot/bot.py
+++ b/LichessClientTG_bot/bot.py
@@ -166,29 +166,37 @@ class LichessBot:
         username = update.message.text.strip()
         user_id = update.effective_user.id
         
-        if username:
-            # Add gamer to database (without token)
-            gamer_id = self.db.add_gamer(username)
-            # Link user to gamer (without token)
-            self.db.add_user_gamer(user_id, gamer_id, None)
-            
-            # Set default period to 1 hour (60 minutes) for new gamer
-            self.db.set_user_gamer_period(user_id, gamer_id, 60)
-            
-            # If this is the first gamer for this user, make it active
-            user_gamers = self.db.get_user_gamers(user_id)
-            if len(user_gamers) == 1:
-                self.db.set_user_active_gamer(user_id, gamer_id)
-            
-            await update.message.reply_text(
-                f"✅ Игрок {username} успешно добавлен!"
-            )
-        else:
+        if not username:
             await update.message.reply_text(
                 "❌ Username не может быть пустым. Попробуйте еще раз."
             )
             return WAITING_FOR_USERNAME
         
+        # Check if user exists on Lichess
+        user_exists = await self.lichess_api.check_user_exists(username)
+        if not user_exists:
+            await update.message.reply_text(
+                f"❌ Игрок {username} не найден на Lichess. Проверьте правильность написания имени."
+            )
+            return WAITING_FOR_USERNAME
+        
+        # Add gamer to database (without token)
+        gamer_id = self.db.add_gamer(username)
+        # Link user to gamer (without token)
+        self.db.add_user_gamer(user_id, gamer_id, None)
+        
+        # Set default period to 1 hour (60 minutes) for new gamer
+        self.db.set_user_gamer_period(user_id, gamer_id, 60)
+        
+        # If this is the first gamer for this user, make it active
+        user_gamers = self.db.get_user_gamers(user_id)
+        if len(user_gamers) == 1:
+            self.db.set_user_active_gamer(user_id, gamer_id)
+        
+        await update.message.reply_text(
+            f"✅ Игрок {username} успешно добавлен!"
+        )
+        
         return ConversationHandler.END
     
     async def getgamers(self, update: Update, context: ContextTypes.DEFAULT_TYPE):
diff --git a/LichessClientTG_bot/lichess_api.py b/LichessClientTG_bot/lichess_api.py
index 3bd0d91..d8f0056 100644
--- a/LichessClientTG_bot/lichess_api.py
+++ b/LichessClientTG_bot/lichess_api.py
@@ -118,6 +118,25 @@ class LichessAPI:
             logger.error(f"Error getting puzzles period: {e}")
             return None
     
+    async def check_user_exists(self, username: str) -> bool:
+        """Check if user exists on Lichess"""
+        try:
+            async with aiohttp.ClientSession() as session:
+                async with session.get(
+                    f"{self.lichess_base_url}/user/{username}"
+                ) as response:
+                    if response.status == 200:
+                        return True
+                    elif response.status == 404:
+                        logger.warning(f"User {username} not found on Lichess (404)")
+                        return False
+                    else:
+                        logger.error(f"Failed to check user existence: {response.status}")
+                        return False
+        except Exception as e:
+            logger.error(f"Error checking user existence: {e}")
+            return False
+    
     async def get_user_ratings(self, username: str) -> Optional[Dict[str, Any]]:
         """Get user ratings from Lichess API"""
         try: