diff --git a/src/gui/image/qicon.cpp b/src/gui/image/qicon.cpp
index 80fa65daac..0166a06abe 100644
--- a/src/gui/image/qicon.cpp
+++ b/src/gui/image/qicon.cpp
@@ -121,7 +121,10 @@ Q_GLOBAL_STATIC(IconCache, qtIconCache)
 
 static void qt_cleanup_icon_cache()
 {
-    qtIconCache()->clear();
+    IconCache* cache = qtIconCache();
+    if( cache ){
+        qtIconCache()->clear();
+    }
 }
 
 /*! \internal
diff --git a/src/gui/kernel/qtouchdevice.cpp b/src/gui/kernel/qtouchdevice.cpp
index 511e92566e..371f2e9326 100644
--- a/src/gui/kernel/qtouchdevice.cpp
+++ b/src/gui/kernel/qtouchdevice.cpp
@@ -208,8 +208,10 @@ static QBasicMutex devicesMutex;
 static void cleanupDevicesList()
 {
     QMutexLocker lock(&devicesMutex);
-    qDeleteAll(*deviceList());
-    deviceList()->clear();
+    if (deviceList()){
+        qDeleteAll(*deviceList());
+        deviceList()->clear();
+    }
 }
 
 /*!
diff --git a/src/gui/painting/qbrush.cpp b/src/gui/painting/qbrush.cpp
index f56be55325..507d8384da 100644
--- a/src/gui/painting/qbrush.cpp
+++ b/src/gui/painting/qbrush.cpp
@@ -167,7 +167,9 @@ Q_GLOBAL_STATIC(QBrushPatternImageCache, qt_brushPatternImageCache)
 
 static void qt_cleanup_brush_pattern_image_cache()
 {
-    qt_brushPatternImageCache()->cleanup();
+    if(qt_brushPatternImageCache()) {
+        qt_brushPatternImageCache()->cleanup();
+    }
 }
 
 Q_GUI_EXPORT QImage qt_imageForBrush(int brushStyle, bool invert)
diff --git a/src/gui/text/qfontdatabase.cpp b/src/gui/text/qfontdatabase.cpp
index fe7dd80e44..58e4ac8cbd 100644
--- a/src/gui/text/qfontdatabase.cpp
+++ b/src/gui/text/qfontdatabase.cpp
@@ -2620,6 +2620,9 @@ bool QFontDatabase::removeAllApplicationFonts()
     QMutexLocker locker(fontDatabaseMutex());
 
     QFontDatabasePrivate *db = privateDb();
+    if (!db) {
+        return true;
+    }
     if (db->applicationFonts.isEmpty())
         return false;