diff --git a/cockatrice/src/tab_supervisor.h b/cockatrice/src/tab_supervisor.h
index 10b6fbad..e3b128df 100644
--- a/cockatrice/src/tab_supervisor.h
+++ b/cockatrice/src/tab_supervisor.h
@@ -31,6 +31,7 @@ public:
 	void retranslateUi();
 	void start(Client *_client);
 	void stop();
+	int getGameCount() const { return gameTabs.size(); }
 signals:
 	void setMenu(QMenu *menu);
 private slots:
diff --git a/cockatrice/src/window_main.cpp b/cockatrice/src/window_main.cpp
index 7e887b45..ef6c6a07 100644
--- a/cockatrice/src/window_main.cpp
+++ b/cockatrice/src/window_main.cpp
@@ -207,8 +207,15 @@ MainWindow::MainWindow(QWidget *parent)
 	resize(900, 700);
 }
 
-void MainWindow::closeEvent(QCloseEvent */*event*/)
+void MainWindow::closeEvent(QCloseEvent *event)
 {
+	if (tabSupervisor->getGameCount()) {
+		if (QMessageBox::question(this, tr("Are you sure?"), tr("There are still open games. Are you sure you want to quit?"), QMessageBox::Yes | QMessageBox::No, QMessageBox::No) == QMessageBox::No) {
+			event->ignore();
+			return;
+		}
+	}
+	event->accept();
 	delete tabSupervisor;
 }
 
diff --git a/cockatrice/translations/cockatrice_de.ts b/cockatrice/translations/cockatrice_de.ts
index 274c9c5e..244bba3c 100644
--- a/cockatrice/translations/cockatrice_de.ts
+++ b/cockatrice/translations/cockatrice_de.ts
@@ -925,7 +925,7 @@
 <context>
     <name>GameView</name>
     <message>
-        <location filename="../src/gameview.cpp" line="15"/>
+        <location filename="../src/gameview.cpp" line="16"/>
         <source>Esc</source>
         <translation>Esc</translation>
     </message>
@@ -1084,6 +1084,16 @@
         <source>&amp;Disconnect</source>
         <translation>Verbindung &amp;trennen</translation>
     </message>
+    <message>
+        <location filename="../src/window_main.cpp" line="213"/>
+        <source>Are you sure?</source>
+        <translation>Sind Sie sicher?</translation>
+    </message>
+    <message>
+        <location filename="../src/window_main.cpp" line="213"/>
+        <source>There are still open games. Are you sure you want to quit?</source>
+        <translation>Es gibt noch offene Spiele. Wollen Sie das Programm wirklich beenden?</translation>
+    </message>
     <message>
         <source>&amp;Restart game...</source>
         <translation type="obsolete">Spiel neu sta&amp;rten...</translation>
@@ -1784,57 +1794,57 @@
 <context>
     <name>PhasesToolbar</name>
     <message>
-        <location filename="../src/phasestoolbar.cpp" line="115"/>
+        <location filename="../src/phasestoolbar.cpp" line="117"/>
         <source>Untap step</source>
         <translation>Enttappsegment</translation>
     </message>
     <message>
-        <location filename="../src/phasestoolbar.cpp" line="116"/>
+        <location filename="../src/phasestoolbar.cpp" line="118"/>
         <source>Upkeep step</source>
         <translation>Versorgungssegment</translation>
     </message>
     <message>
-        <location filename="../src/phasestoolbar.cpp" line="117"/>
+        <location filename="../src/phasestoolbar.cpp" line="119"/>
         <source>Draw step</source>
         <translation>Ziehsegment</translation>
     </message>
     <message>
-        <location filename="../src/phasestoolbar.cpp" line="118"/>
+        <location filename="../src/phasestoolbar.cpp" line="120"/>
         <source>First main phase</source>
         <translation>erste Hauptphase</translation>
     </message>
     <message>
-        <location filename="../src/phasestoolbar.cpp" line="119"/>
+        <location filename="../src/phasestoolbar.cpp" line="121"/>
         <source>Beginning of combat step</source>
         <translation>Anfangssegment der Kampfphase</translation>
     </message>
     <message>
-        <location filename="../src/phasestoolbar.cpp" line="120"/>
+        <location filename="../src/phasestoolbar.cpp" line="122"/>
         <source>Declare attackers step</source>
         <translation>Angreifer-Deklarieren-Segment</translation>
     </message>
     <message>
-        <location filename="../src/phasestoolbar.cpp" line="121"/>
+        <location filename="../src/phasestoolbar.cpp" line="123"/>
         <source>Declare blockers step</source>
         <translation>Blocker-Deklarieren-Segment</translation>
     </message>
     <message>
-        <location filename="../src/phasestoolbar.cpp" line="122"/>
+        <location filename="../src/phasestoolbar.cpp" line="124"/>
         <source>Combat damage step</source>
         <translation>Kampfschadenssegment</translation>
     </message>
     <message>
-        <location filename="../src/phasestoolbar.cpp" line="123"/>
+        <location filename="../src/phasestoolbar.cpp" line="125"/>
         <source>End of combat step</source>
         <translation>Endsegment der Kampfphase</translation>
     </message>
     <message>
-        <location filename="../src/phasestoolbar.cpp" line="124"/>
+        <location filename="../src/phasestoolbar.cpp" line="126"/>
         <source>Second main phase</source>
         <translation>zweite Hauptphase</translation>
     </message>
     <message>
-        <location filename="../src/phasestoolbar.cpp" line="125"/>
+        <location filename="../src/phasestoolbar.cpp" line="127"/>
         <source>End of turn step</source>
         <translation>Ende-des-Zuges-Segment</translation>
     </message>
@@ -2176,12 +2186,12 @@
     </message>
     <message>
         <location filename="../src/player.cpp" line="430"/>
-        <location filename="../src/player.cpp" line="965"/>
+        <location filename="../src/player.cpp" line="964"/>
         <source>Number:</source>
         <translation>Anzahl:</translation>
     </message>
     <message>
-        <location filename="../src/player.cpp" line="965"/>
+        <location filename="../src/player.cpp" line="964"/>
         <source>Set counters</source>
         <translation>Setze Zählmarken</translation>
     </message>
@@ -2285,17 +2295,17 @@
 <context>
     <name>RemoteDeckList_TreeModel</name>
     <message>
-        <location filename="../src/remotedecklist_treewidget.cpp" line="153"/>
+        <location filename="../src/remotedecklist_treewidget.cpp" line="157"/>
         <source>Name</source>
         <translation>Name</translation>
     </message>
     <message>
-        <location filename="../src/remotedecklist_treewidget.cpp" line="154"/>
+        <location filename="../src/remotedecklist_treewidget.cpp" line="158"/>
         <source>ID</source>
         <translation>ID</translation>
     </message>
     <message>
-        <location filename="../src/remotedecklist_treewidget.cpp" line="155"/>
+        <location filename="../src/remotedecklist_treewidget.cpp" line="159"/>
         <source>Upload time</source>
         <translation>Änderungsdatum</translation>
     </message>
diff --git a/cockatrice/translations/cockatrice_en.ts b/cockatrice/translations/cockatrice_en.ts
index 35ee2567..de83275a 100644
--- a/cockatrice/translations/cockatrice_en.ts
+++ b/cockatrice/translations/cockatrice_en.ts
@@ -552,7 +552,7 @@
 <context>
     <name>GameView</name>
     <message>
-        <location filename="../src/gameview.cpp" line="15"/>
+        <location filename="../src/gameview.cpp" line="16"/>
         <source>Esc</source>
         <translation type="unfinished"></translation>
     </message>
@@ -737,6 +737,16 @@
         <source>&amp;Cockatrice</source>
         <translation type="unfinished"></translation>
     </message>
+    <message>
+        <location filename="../src/window_main.cpp" line="213"/>
+        <source>Are you sure?</source>
+        <translation type="unfinished"></translation>
+    </message>
+    <message>
+        <location filename="../src/window_main.cpp" line="213"/>
+        <source>There are still open games. Are you sure you want to quit?</source>
+        <translation type="unfinished"></translation>
+    </message>
 </context>
 <context>
     <name>MessageLogWidget</name>
@@ -1107,57 +1117,57 @@
 <context>
     <name>PhasesToolbar</name>
     <message>
-        <location filename="../src/phasestoolbar.cpp" line="115"/>
+        <location filename="../src/phasestoolbar.cpp" line="117"/>
         <source>Untap step</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="../src/phasestoolbar.cpp" line="116"/>
+        <location filename="../src/phasestoolbar.cpp" line="118"/>
         <source>Upkeep step</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="../src/phasestoolbar.cpp" line="117"/>
+        <location filename="../src/phasestoolbar.cpp" line="119"/>
         <source>Draw step</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="../src/phasestoolbar.cpp" line="118"/>
+        <location filename="../src/phasestoolbar.cpp" line="120"/>
         <source>First main phase</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="../src/phasestoolbar.cpp" line="119"/>
+        <location filename="../src/phasestoolbar.cpp" line="121"/>
         <source>Beginning of combat step</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="../src/phasestoolbar.cpp" line="120"/>
+        <location filename="../src/phasestoolbar.cpp" line="122"/>
         <source>Declare attackers step</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="../src/phasestoolbar.cpp" line="121"/>
+        <location filename="../src/phasestoolbar.cpp" line="123"/>
         <source>Declare blockers step</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="../src/phasestoolbar.cpp" line="122"/>
+        <location filename="../src/phasestoolbar.cpp" line="124"/>
         <source>Combat damage step</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="../src/phasestoolbar.cpp" line="123"/>
+        <location filename="../src/phasestoolbar.cpp" line="125"/>
         <source>End of combat step</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="../src/phasestoolbar.cpp" line="124"/>
+        <location filename="../src/phasestoolbar.cpp" line="126"/>
         <source>Second main phase</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="../src/phasestoolbar.cpp" line="125"/>
+        <location filename="../src/phasestoolbar.cpp" line="127"/>
         <source>End of turn step</source>
         <translation type="unfinished"></translation>
     </message>
@@ -1463,7 +1473,7 @@
     </message>
     <message>
         <location filename="../src/player.cpp" line="430"/>
-        <location filename="../src/player.cpp" line="965"/>
+        <location filename="../src/player.cpp" line="964"/>
         <source>Number:</source>
         <translation type="unfinished"></translation>
     </message>
@@ -1488,7 +1498,7 @@
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="../src/player.cpp" line="965"/>
+        <location filename="../src/player.cpp" line="964"/>
         <source>Set counters</source>
         <translation type="unfinished"></translation>
     </message>
@@ -1552,17 +1562,17 @@
 <context>
     <name>RemoteDeckList_TreeModel</name>
     <message>
-        <location filename="../src/remotedecklist_treewidget.cpp" line="153"/>
+        <location filename="../src/remotedecklist_treewidget.cpp" line="157"/>
         <source>Name</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="../src/remotedecklist_treewidget.cpp" line="154"/>
+        <location filename="../src/remotedecklist_treewidget.cpp" line="158"/>
         <source>ID</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="../src/remotedecklist_treewidget.cpp" line="155"/>
+        <location filename="../src/remotedecklist_treewidget.cpp" line="159"/>
         <source>Upload time</source>
         <translation type="unfinished"></translation>
     </message>