diff --git a/startkde/plasma-session/startup.h b/startkde/plasma-session/startup.h
--- a/startkde/plasma-session/startup.h
+++ b/startkde/plasma-session/startup.h
@@ -92,6 +92,7 @@
 private:
     const QString m_process;
     const QStringList m_args;
+    const QString m_serviceId;
 };
 
 class RestoreSessionJob: public KJob
diff --git a/startkde/plasma-session/startup.cpp b/startkde/plasma-session/startup.cpp
--- a/startkde/plasma-session/startup.cpp
+++ b/startkde/plasma-session/startup.cpp
@@ -417,14 +417,21 @@
 StartServiceJob::StartServiceJob(const QString &process, const QStringList &args, const QString &serviceId):
     KJob(),
     m_process(process),
-    m_args(args)
+    m_args(args),
+    m_serviceId(serviceId)
 {
     auto watcher = new QDBusServiceWatcher(serviceId, QDBusConnection::sessionBus(), QDBusServiceWatcher::WatchForRegistration, this);
     connect(watcher, &QDBusServiceWatcher::serviceRegistered, this, &StartServiceJob::emitResult);
 }
 
 void StartServiceJob::start()
 {
+    if (QDBusConnection::sessionBus().interface()->isServiceRegistered(m_serviceId)) {
+        qCDebug(PLASMA_SESSION) << m_process << "already running";
+        emitResult();
+        return;
+    }
+    qCDebug(PLASMA_SESSION) << "Starting " << m_process << m_args;
     QProcess::startDetached(m_process, m_args);
 }