Index: qgsrasterlayer.cpp
===================================================================
--- qgsrasterlayer.cpp	(révision 8647)
+++ qgsrasterlayer.cpp	(copie de travail)
@@ -421,6 +421,18 @@
 
   //check f this file has pyramids
   GDALRasterBandH myGDALBand = GDALGetRasterBand( mGdalDataset, 1 ); //just use the first band
+  if (myGDALBand == NULL)
+  {
+      // the dataset is probably a raster with subdatasets
+      // It would be good to support subdatasets
+      GDALDereferenceDataset(mGdalBaseDataset);
+      mGdalBaseDataset = NULL;
+
+      GDALClose(mGdalDataset);
+      mGdalDataset = NULL;
+      mValid = FALSE;
+      return false;
+  }
   if( GDALGetOverviewCount(myGDALBand) > 0 )
   {
     hasPyramidsFlag=true;