diff --git a/src/gui/image/qimage.cpp b/src/gui/image/qimage.cpp
index ee77a32b86..17d3c02e36 100644
--- a/src/gui/image/qimage.cpp
+++ b/src/gui/image/qimage.cpp
@@ -2117,7 +2117,7 @@ static QImage convertWithPalette(const QImage &src, QImage::Format format,
 */
 QImage QImage::convertToFormat(Format format, const QVector<QRgb> &colorTable, Qt::ImageConversionFlags flags) const
 {
-    if (d->format == format)
+    if (!d || d->format == format)
         return *this;
 
     if (format <= QImage::Format_Indexed8 && depth() == 32) {