3 files changed, 7 insertions, 0 deletions
diff --git a/src/gui/painting/qprinterinfo_mac.cpp b/src/gui/painting/qprinterinfo_mac.cpp
index 8d41217..033682a 100644
--- a/src/gui/painting/qprinterinfo_mac.cpp
+++ b/src/gui/painting/qprinterinfo_mac.cpp
@@ -87,6 +87,8 @@ QList<QPrinter::PaperSize> QPrinterInfo::supportedPaperSizes() const
     const Q_D(QPrinterInfo);
 
     QList<QPrinter::PaperSize> paperSizes;
+    if (isNull())
+        return paperSizes;
 
     PMPrinter cfPrn = PMPrinterCreateFromPrinterID(QCFString::toCFStringRef(d->name));
     if (!cfPrn)
diff --git a/src/gui/painting/qprinterinfo_unix.cpp b/src/gui/painting/qprinterinfo_unix.cpp
index be24bd7..af2e52a 100644
--- a/src/gui/painting/qprinterinfo_unix.cpp
+++ b/src/gui/painting/qprinterinfo_unix.cpp
@@ -898,6 +898,9 @@ QList<QPrinter::PaperSize> QPrinterInfo::supportedPaperSizes() const
 #if !defined(QT_NO_CUPS) && !defined(QT_NO_LIBRARY)
     const Q_D(QPrinterInfo);
 
+    if (isNull())
+        return d->paperSizes;
+
     if (!d->hasPaperSizes) {
         d->hasPaperSizes = true;
 
diff --git a/src/gui/painting/qprinterinfo_win.cpp b/src/gui/painting/qprinterinfo_win.cpp
index f7b6874..2d25063 100644
--- a/src/gui/painting/qprinterinfo_win.cpp
+++ b/src/gui/painting/qprinterinfo_win.cpp
@@ -100,6 +100,8 @@ QList<QPrinter::PaperSize> QPrinterInfo::supportedPaperSizes() const
     const Q_D(QPrinterInfo);
 
     QList<QPrinter::PaperSize> paperSizes;
+    if (isNull())
+        return paperSizes;
 
     DWORD size = DeviceCapabilities(reinterpret_cast<const wchar_t*>(d->name.utf16()),
                                     NULL, DC_PAPERS, NULL, NULL);