diff --git a/resources/desktop/com.github.rssguard.appdata.xml b/resources/desktop/com.github.rssguard.appdata.xml
index 0fccbcbc8..e5dcfdc46 100644
--- a/resources/desktop/com.github.rssguard.appdata.xml
+++ b/resources/desktop/com.github.rssguard.appdata.xml
@@ -30,7 +30,7 @@
   <url type="donation">https://martinrotter.github.io/donate/</url>
   <content_rating type="oars-1.1" />
   <releases>
-    <release version="3.9.2" date="2021-05-19"/>
+    <release version="3.9.2" date="2021-05-20"/>
   </releases>
   <content_rating type="oars-1.0">
     <content_attribute id="violence-cartoon">none</content_attribute>
diff --git a/src/librssguard/miscellaneous/application.cpp b/src/librssguard/miscellaneous/application.cpp
index 48831ff5a..e96e8c1a0 100755
--- a/src/librssguard/miscellaneous/application.cpp
+++ b/src/librssguard/miscellaneous/application.cpp
@@ -360,6 +360,11 @@ void Application::restoreDatabaseSettings(bool restore_database, bool restore_se
 }
 
 void Application::parseCmdArgumentsFromOtherInstance(const QString& message) {
+  if (message.isEmpty()) {
+    qDebugNN << LOGSEC_CORE << "No execution message received from other app instances.";
+    return;
+  }
+
   qDebugNN << LOGSEC_CORE
            << "Received"
            << QUOTE_W_SPACE(message)
diff --git a/src/librssguard/services/greader/greadernetwork.cpp b/src/librssguard/services/greader/greadernetwork.cpp
index c2b4693e7..8f4f4b583 100755
--- a/src/librssguard/services/greader/greadernetwork.cpp
+++ b/src/librssguard/services/greader/greadernetwork.cpp
@@ -379,13 +379,17 @@ QNetworkReply::NetworkError GreaderNetwork::clientLogin(const QNetworkProxy& pro
   QString full_url = generateFullUrl(Operations::ClientLogin);
   auto timeout = qApp->settings()->value(GROUP(Feeds), SETTING(Feeds::UpdateTimeout)).toInt();
   QByteArray output;
-  QByteArray args = QSL("Email=%1&Passwd=%2").arg(username(), password()).toUtf8();
+  QByteArray args = QSL("Email=%1&Passwd=%2").arg(QString::fromLocal8Bit(QUrl::toPercentEncoding(username())),
+                                                  QString::fromLocal8Bit(QUrl::toPercentEncoding(password()))).toLocal8Bit();
   auto network_result = NetworkFactory::performNetworkOperation(full_url,
                                                                 timeout,
                                                                 args,
                                                                 output,
                                                                 QNetworkAccessManager::Operation::PostOperation,
-                                                                {},
+                                                                { {
+                                                                  QSL(HTTP_HEADERS_CONTENT_TYPE).toLocal8Bit(),
+                                                                  QSL("application/x-www-form-urlencoded").toLocal8Bit()
+                                                                } },
                                                                 false,
                                                                 {},
                                                                 {},