bug fix when grid connection is down

diff --git a/STEER/AliCDBGrid.cxx b/STEER/AliCDBGrid.cxx
index 647fa52d61f3a10d3af95e131219dfeb0d2c24e3..4be6865a44b2b31757a453b5f42dbd2014ec68cd 100644 (file)
--- a/STEER/AliCDBGrid.cxx
+++ b/STEER/AliCDBGrid.cxx
@@ -859,6 +859,11 @@ void AliCDBGrid::QueryValidFiles()
 
        TGridResult *res = gGrid->Query(fDBFolder, pattern, filter, "");
 
+       if (!res) {
+               AliError("Grid query failed");
+               return;
+       }
+
        AliCDBId validFileId;
        for(int i=0; i<res->GetEntries(); i++){
                TString filename = res->GetKey(i, "lfn");