diff --git a/README.md b/README.md
index 85993ece7..c275a14de 100644
--- a/README.md
+++ b/README.md
@@ -244,8 +244,9 @@ Please note that we don't offer free support and these contributions will be add
 
 ### Languages
 
-Linphone is getting a full internationalization support, using Transifex platform.
-If you want you can contribute at: https://www.transifex.com/belledonne-communications/linphone-desktop/languages/
+Linphone is getting a full internationalization support.
+We no longer use transifex for the translation process, instead we have deployed our own instance of [Weblate](https://weblate.linphone.org).
+If you want you can contribute at: https://weblate.linphone.org/projects/linphone-desktop/
 
 ### Feedback or bug reporting
 
diff --git a/linphone-app/src/components/participant-imdn/ParticipantImdnStateListModel.cpp b/linphone-app/src/components/participant-imdn/ParticipantImdnStateListModel.cpp
index a3cf37578..4b18ae634 100644
--- a/linphone-app/src/components/participant-imdn/ParticipantImdnStateListModel.cpp
+++ b/linphone-app/src/components/participant-imdn/ParticipantImdnStateListModel.cpp
@@ -40,9 +40,11 @@ ParticipantImdnStateListModel::ParticipantImdnStateListModel (std::shared_ptr<li
 	for(int i = 0 ; i < states.size() ; ++i){
 		std::list<std::shared_ptr<linphone::ParticipantImdnState>> imdns = message->getParticipantsByImdnState(states[i]);
 		for(auto imdn : imdns){
-			auto deviceModel = std::make_shared<ParticipantImdnStateModel>(imdn);
+			if(imdn->getParticipant()){
+				auto deviceModel = std::make_shared<ParticipantImdnStateModel>(imdn);
 			//connect(this, &ParticipantDeviceListModel::securityLevelChanged, deviceModel.get(), &ParticipantDeviceModel::onSecurityLevelChanged);
-			mList << deviceModel;
+				mList << deviceModel;
+			}
 		}
 	}
 }
@@ -118,7 +120,8 @@ std::shared_ptr<ParticipantImdnStateModel> ParticipantImdnStateListModel::getImd
 //--------------------------------------------------------------------------------
 
 void ParticipantImdnStateListModel::updateState(const std::shared_ptr<const linphone::ParticipantImdnState> & state){
-	getImdnState(state)->update(state);
+	if(state->getParticipant())
+		getImdnState(state)->update(state);
 }
 
 //--------------------------------------------------------------------------------
diff --git a/linphone-app/src/components/participant-imdn/ParticipantImdnStateModel.cpp b/linphone-app/src/components/participant-imdn/ParticipantImdnStateModel.cpp
index 3f5b41bc8..41ff8fa88 100644
--- a/linphone-app/src/components/participant-imdn/ParticipantImdnStateModel.cpp
+++ b/linphone-app/src/components/participant-imdn/ParticipantImdnStateModel.cpp
@@ -34,7 +34,9 @@ ParticipantImdnStateModel::ParticipantImdnStateModel (const std::shared_ptr<cons
 	App::getInstance()->getEngine()->setObjectOwnership(this, QQmlEngine::CppOwnership);// Avoid QML to destroy it when passing by Q_INVOKABLE
 	setState(LinphoneEnums::fromLinphone(imdn->getState()));
 	setStateChangeTime(QDateTime::fromSecsSinceEpoch(imdn->getStateChangeTime())) ;
-	mAddress = imdn->getParticipant()->getAddress()->clone();
+	auto participant = imdn->getParticipant();
+	if(participant)
+		mAddress = imdn->getParticipant()->getAddress()->clone();
 }
 
 // -----------------------------------------------------------------------------
diff --git a/linphone-app/src/utils/Utils.cpp b/linphone-app/src/utils/Utils.cpp
index c91345bc8..a03e4ddee 100644
--- a/linphone-app/src/utils/Utils.cpp
+++ b/linphone-app/src/utils/Utils.cpp
@@ -461,15 +461,17 @@ void Utils::copyDir(QString from, QString to) {
 }
 
 QString Utils::getDisplayName(const std::shared_ptr<const linphone::Address>& address){
-	QString qtAddress = Utils::coreStringToAppString(address->asString());
 	QString displayName;
-	ContactModel * model = CoreManager::getInstance()->getContactsListModel()->findContactModelFromSipAddress(qtAddress);
-	if(model && model->getVcardModel())
-		displayName = model->getVcardModel()->getUsername();
-	else{
-		displayName = Utils::coreStringToAppString(address->getDisplayName());
-		if(displayName == "")
-			displayName = Utils::coreStringToAppString(address->getUsername());
+	if(address){
+		QString qtAddress = Utils::coreStringToAppString(address->asString());
+		ContactModel * model = CoreManager::getInstance()->getContactsListModel()->findContactModelFromSipAddress(qtAddress);
+		if(model && model->getVcardModel())
+			displayName = model->getVcardModel()->getUsername();
+		else{
+			displayName = Utils::coreStringToAppString(address->getDisplayName());
+			if(displayName == "")
+				displayName = Utils::coreStringToAppString(address->getUsername());
+		}
 	}
 	return displayName;
 }
diff --git a/linphone-app/ui/modules/Linphone/Chat/OutgoingMessage.qml b/linphone-app/ui/modules/Linphone/Chat/OutgoingMessage.qml
index 134ba09ed..b806a7875 100644
--- a/linphone-app/ui/modules/Linphone/Chat/OutgoingMessage.qml
+++ b/linphone-app/ui/modules/Linphone/Chat/OutgoingMessage.qml
@@ -45,7 +45,7 @@ Item {
 
           icon: isError
             ? 'chat_error'
-            : (isRead ? 'chat_read' : (isDelivered ? 'chat_delivered' : ''))
+            : (isRead ? 'chat_read' : isDelivered ? 'chat_delivered' : '')
           iconSize: ChatStyle.entry.message.outgoing.sendIconSize
 
           MouseArea {