diff --git a/src/Gui/Tree.cpp b/src/Gui/Tree.cpp
index b28ee5c9e0..a64c42dc2f 100644
--- a/src/Gui/Tree.cpp
+++ b/src/Gui/Tree.cpp
@@ -115,11 +115,11 @@ TreeWidget::TreeWidget(QWidget* parent)
             this, SLOT(onSearchObjects()));
 
     // Setup connections
-    Application::Instance->signalNewDocument.connect(boost::bind(&TreeWidget::slotNewDocument, this, _1));
-    Application::Instance->signalDeleteDocument.connect(boost::bind(&TreeWidget::slotDeleteDocument, this, _1));
-    Application::Instance->signalRenameDocument.connect(boost::bind(&TreeWidget::slotRenameDocument, this, _1));
-    Application::Instance->signalActiveDocument.connect(boost::bind(&TreeWidget::slotActiveDocument, this, _1));
-    Application::Instance->signalRelabelDocument.connect(boost::bind(&TreeWidget::slotRelabelDocument, this, _1));
+    connectNewDocument = Application::Instance->signalNewDocument.connect(boost::bind(&TreeWidget::slotNewDocument, this, _1));
+    connectDelDocument = Application::Instance->signalDeleteDocument.connect(boost::bind(&TreeWidget::slotDeleteDocument, this, _1));
+    connectRenDocument = Application::Instance->signalRenameDocument.connect(boost::bind(&TreeWidget::slotRenameDocument, this, _1));
+    connectActDocument = Application::Instance->signalActiveDocument.connect(boost::bind(&TreeWidget::slotActiveDocument, this, _1));
+    connectRelDocument = Application::Instance->signalRelabelDocument.connect(boost::bind(&TreeWidget::slotRelabelDocument, this, _1));
 
     QStringList labels;
     labels << tr("Labels & Attributes");
@@ -163,6 +163,11 @@ TreeWidget::TreeWidget(QWidget* parent)
 
 TreeWidget::~TreeWidget()
 {
+    connectNewDocument.disconnect();
+    connectDelDocument.disconnect();
+    connectRenDocument.disconnect();
+    connectActDocument.disconnect();
+    connectRelDocument.disconnect();
 }
 
 void TreeWidget::contextMenuEvent (QContextMenuEvent * e)
diff --git a/src/Gui/Tree.h b/src/Gui/Tree.h
index d39df0d75c..820bc08be5 100644
--- a/src/Gui/Tree.h
+++ b/src/Gui/Tree.h
@@ -144,6 +144,13 @@ private:
     static QPixmap* documentPixmap;
     std::map<const Gui::Document*,DocumentItem*> DocumentMap;
     bool fromOutside;
+
+    typedef boost::signals2::connection Connection;
+    Connection connectNewDocument;
+    Connection connectDelDocument;
+    Connection connectRenDocument;
+    Connection connectActDocument;
+    Connection connectRelDocument;
 };
 
 /** The link between the tree and a document.