diff --git a/conjuntasbot/conjuntasbot.py b/conjuntasbot/conjuntasbot.py
index 57121f1..fa3c8e9 100644
--- a/conjuntasbot/conjuntasbot.py
+++ b/conjuntasbot/conjuntasbot.py
@@ -367,21 +367,24 @@ async def handle_conjunta(update: Update, context: CallbackContext):
                         if limit is not None and quantity > limit_per_user or limit is not None and quantity > quantity_left(conjunta_id):
                             await update.message.reply_text("La cantidad deseada excede el límite por usuario de la conjunta o no quedan suficientes.")
                         else:
-                            cursor.execute("INSERT INTO conjunta_users (conjunta_id, user_id, user_name, quantity) VALUES (?, ?, ?, ?)",
-                                        (conjunta_id, user_id, user_name, quantity))
-                            conn.commit()
+                            if user_name:
+                                cursor.execute("INSERT INTO conjunta_users (conjunta_id, user_id, user_name, quantity) VALUES (?, ?, ?, ?)",
+                                            (conjunta_id, user_id, user_name, quantity))
+                                conn.commit()
 
-                            socios_worksheet = spreadsheet.worksheet("Socios")
-                            socio = socios_worksheet.find(user_name)
-                            
-                            worksheet = spreadsheet.worksheet(f"{product_name} - {conjunta_id}")
-                            worksheet.append_row([user_name, quantity, "SÍ" if socio else "NO"])
-                            
-                            await update.message.reply_text(f"Te has unido a la conjunta para '{product_name}' con {quantity} unidades.")
-                            try:
-                                await update_conjunta(update, context, conjunta_id)
-                            except Exception:
-                                pass
+                                socios_worksheet = spreadsheet.worksheet("Socios")
+                                socio = socios_worksheet.find(user_name)
+                                
+                                worksheet = spreadsheet.worksheet(f"{product_name} - {conjunta_id}")
+                                worksheet.append_row([user_name, quantity, "SÍ" if socio else "NO"])
+                                
+                                await update.message.reply_text(f"Te has unido a la conjunta para '{product_name}' con {quantity} unidades.")
+                                try:
+                                    await update_conjunta(update, context, conjunta_id)
+                                except Exception:
+                                    pass
+                            else:
+                                await update.message.reply_text("Por favor, tienes que ponerte un nick en Telegram para poder participar.")
                     except ValueError:
                         await update.message.reply_text("Por favor, introduce una cantidad válida.")
             else: