coverity fix

diff --git a/TOF/AliTOFPreprocessor.cxx b/TOF/AliTOFPreprocessor.cxx
index 8506b65587162715d2555dfae2ab71cb146b9dc8..c78fbe3ea8ab51b8d85ef8c3f846321c8871dbfb 100644 (file)
--- a/TOF/AliTOFPreprocessor.cxx
+++ b/TOF/AliTOFPreprocessor.cxx
@@ -562,7 +562,11 @@ UInt_t AliTOFPreprocessor::ProcessOnlineDelays()
                  AliInfo("The following sources produced files with the id DELAYS");
                  listTot->Print();
                  for (Int_t jj=0;jj<listTot->GetEntries();jj++){
-                         TObjString * str = dynamic_cast<TObjString*> (listTot->At(jj));
+                   TObjString * str = dynamic_cast<TObjString*> (listTot->At(jj));
+                   if (!str) {
+                     AliError("dynamic_cast returned NULL");
+                                   return 4;
+                         }
                          AliInfo(Form("found source %s", str->String().Data()));
                          
                          // file with summed histos, to extract calib params