diff --git a/mail_base/__manifest__.py b/mail_base/__manifest__.py
index 434e370..3ce27de 100644
--- a/mail_base/__manifest__.py
+++ b/mail_base/__manifest__.py
@@ -4,7 +4,7 @@
     "summary": """Makes Mail extendable""",
     "category": "Discuss",
     "images": [],
-    "version": "1.0.4",
+    "version": "1.0.5",
 
     "author": "IT-Projects LLC, Pavel Romanchenko",
     "support": "apps@it-projects.info",
diff --git a/mail_base/controllers/main.py b/mail_base/controllers/main.py
index 06f8695..8463aed 100644
--- a/mail_base/controllers/main.py
+++ b/mail_base/controllers/main.py
@@ -10,6 +10,7 @@ class MailChatController(BusController):
 
     def _poll(self, dbname, channels, last, options):
         if request.session.uid:
+            channels = list(channels)       # do not alter original list
             channels.append((request.db, 'mail_base.mail_sent'))
 
         return super(MailChatController, self)._poll(dbname, channels, last, options)
diff --git a/mail_base/doc/changelog.rst b/mail_base/doc/changelog.rst
index dd41f40..d1474d8 100644
--- a/mail_base/doc/changelog.rst
+++ b/mail_base/doc/changelog.rst
@@ -1,3 +1,7 @@
+`1.0.5`
+-------
+**FIX**: polling errors on heavy server load
+
 `1.0.4`
 -------
 **FIX**: issue related to clear cache
diff --git a/mail_move_message/__manifest__.py b/mail_move_message/__manifest__.py
index 438a563..103e46b 100644
--- a/mail_move_message/__manifest__.py
+++ b/mail_move_message/__manifest__.py
@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
 {
     'name': 'Mail relocation',
-    'version': '1.0.5',
+    'version': '1.0.6',
     'author': 'IT-Projects LLC, Ivan Yelizariev, Pavel Romanchenko',
     'license': 'LGPL-3',
     'category': 'Discuss',
diff --git a/mail_move_message/controllers/main.py b/mail_move_message/controllers/main.py
index bb51fc8..8d1aa9f 100644
--- a/mail_move_message/controllers/main.py
+++ b/mail_move_message/controllers/main.py
@@ -13,6 +13,7 @@ class MailChatController(BusController):
 
     def _poll(self, dbname, channels, last, options):
         if request.session.uid:
+            channels = list(channels)       # do not alter original list
             channels.append((request.db, 'mail_move_message'))
             channels.append((request.db, 'mail_move_message.delete_message'))
         return super(MailChatController, self)._poll(dbname, channels, last, options)
diff --git a/mail_move_message/doc/changelog.rst b/mail_move_message/doc/changelog.rst
index 2021f90..d6f593d 100644
--- a/mail_move_message/doc/changelog.rst
+++ b/mail_move_message/doc/changelog.rst
@@ -1,3 +1,7 @@
+`1.0.6`
+-------
+**FIX**: polling errors on heavy server load
+
 `1.0.5`
 -------