diff --git a/addon/globalPlugins/dual_voice_globalPlugin/__init__.py b/addon/globalPlugins/dual_voice_globalPlugin/__init__.py
index 6072977..f8ea61a 100644
--- a/addon/globalPlugins/dual_voice_globalPlugin/__init__.py
+++ b/addon/globalPlugins/dual_voice_globalPlugin/__init__.py
@@ -32,7 +32,7 @@ def createMenu(self):
 		self.submenu_item = gui.mainFrame.sysTrayIcon.menu.InsertMenu(2, wx.ID_ANY, _("Dual &voice"), self.submenu_dualvoice)
 
 	def onAbout(self, event):
-		gui.messageBox("Version 4.4 by Seyed Mahmood Taghavi-Shahri", _("About the Dual voice add-on for NVDA"), wx.OK)
+		gui.messageBox("Version 4.5 by Seyed Mahmood Taghavi-Shahri", _("About the Dual voice add-on for NVDA"), wx.OK)
 		
 		
 	def onCheckUpdate(self, event):
diff --git a/addon/synthDrivers/dual_sapi5.py b/addon/synthDrivers/dual_sapi5.py
index 099cc8c..f1dc8d2 100644
--- a/addon/synthDrivers/dual_sapi5.py
+++ b/addon/synthDrivers/dual_sapi5.py
@@ -186,11 +186,13 @@ def _getAvailableVoices(self):
 			except COMError:
 				log.warning("Could not get the voice info. Skipping...")
 			voices[ID]=VoiceInfo(ID,name,language)
-			_realtime.list_VoiceAttribName.append(voiceAttribName)
-			_realtime.list_VoiceID.append(ID)
-			_realtime.list_VoiceName.append(name)
-			_realtime.list_VoiceLang.append(language)
-			
+			if voiceAttribName in _realtime.list_VoiceAttribName:
+				log.warning(name + ' has not the required Name attribute in the registry. Hence it could not be used as the secondary voice.')
+			else:
+				_realtime.list_VoiceAttribName.append(voiceAttribName)
+				_realtime.list_VoiceID.append(ID)
+				_realtime.list_VoiceName.append(name)
+				_realtime.list_VoiceLang.append(language)
 		return voices
 
 	def _getVoiceTokens(self):
diff --git a/buildVars.py b/buildVars.py
index 0b8c76b..f83fd3c 100644
--- a/buildVars.py
+++ b/buildVars.py
@@ -19,7 +19,7 @@
 	# Translators: Long description to be shown for this add-on on add-on information from add-ons manager
 	"addon_description" : _("""Read non-Latin and Latin texts using two separate voices."""),
 	# version
-	"addon_version" : "4.4",
+	"addon_version" : "4.5",
 	# Author(s)
 	"addon_author" : u"Seyed Mahmood Taghavi-Shahri <mahmood.taghavi@gmail.com>",
 	# URL for the add-on documentation support
diff --git a/readme.md b/readme.md
index 4271156..57eae92 100644
--- a/readme.md
+++ b/readme.md
@@ -6,7 +6,7 @@ Languages with the non-Latin script are Persian, Arabic, Belarusian, Bulgarian,
 
 You can find more information on the [homepage of the Dual Voice for NVDA](https://mahmood-taghavi.github.io/dual_voice/).
 
-You can download the [latest version of the Dual Voice for NVDA](https://github.com/Mahmood-Taghavi/dual_voice/releases/download/v4.4/dual_voice-4.4.nvda-addon)
+You can download the [latest version of the Dual Voice for NVDA](https://github.com/Mahmood-Taghavi/dual_voice/releases/download/v4.5/dual_voice-4.5.nvda-addon)
 
 Note: You can now use a custom dialog box entitled "Dual voice" in the NVDA menu to select the secondary voice and setting of the Dual voice.