--- qtbase/src/widgets/widgets/qtoolbutton.cpp	Âñ äåê  8 19:09:48 2013
+++ qtbase/src/widgets/widgets/qtoolbutton.cpp	Âñ ÿíâ 19 12:41:39 2014
@@ -778,11 +778,15 @@
     actualMenu->d_func()->causedPopup.action = defaultAction;
     actionsCopy = q->actions(); //(the list of action may be modified in slots)
     actualMenu->exec(p);
-    QObject::disconnect(actualMenu, SIGNAL(aboutToHide()), q, SLOT(_q_updateButtonDown()));
-    if (mustDeleteActualMenu)
+    const bool canDisconnectMenuSignalsFromThis = actualMenu && that;
+    if (canDisconnectMenuSignalsFromThis) {
+        QObject::disconnect(actualMenu, SIGNAL(aboutToHide()), that, SLOT(_q_updateButtonDown()));
+    }
+    if (mustDeleteActualMenu) {
         delete actualMenu;
-    else
-        QObject::disconnect(actualMenu, SIGNAL(triggered(QAction*)), q, SLOT(_q_menuTriggered(QAction*)));
+    } else if (canDisconnectMenuSignalsFromThis) {
+        QObject::disconnect(actualMenu, SIGNAL(triggered(QAction*)), that, SLOT(_q_menuTriggered(QAction*)));
+    }
 
     if (!that)
         return;