diff --git a/src/gui/applicationlauncherjob.cpp b/src/gui/applicationlauncherjob.cpp
--- a/src/gui/applicationlauncherjob.cpp
+++ b/src/gui/applicationlauncherjob.cpp
@@ -132,7 +132,7 @@
 
 qint64 KIO::ApplicationLauncherJob::pid() const
 {
-    return d->m_pids.at(0);
+    return !d->m_pids.isEmpty() ? d->m_pids.at(0) : 0;
 }
 
 QVector<qint64> KIO::ApplicationLauncherJob::pids() const