protect against missing centrality class

diff --git a/PWG1/TRD/AliTRDcheckDET.cxx b/PWG1/TRD/AliTRDcheckDET.cxx
index f628f2c2d9329a83fa472a908bb7c7cb4922fc71..bfad5a5d712090287e778a61c93614dea18f7183 100644 (file)
--- a/PWG1/TRD/AliTRDcheckDET.cxx
+++ b/PWG1/TRD/AliTRDcheckDET.cxx
@@ -1500,7 +1500,7 @@ void AliTRDcheckDET::MakePlotTrackletCharge(){
        for(Int_t icent = 0; icent < AliTRDeventInfo::kCentralityClasses; icent++){
                hQtCent[icent] = hQt->ProjectionX(Form("hQt_%d", icent), icent+1, icent+1);
                if(!hQtCent[icent]->GetEntries()){
-                       delete hQtCent[icent];
+                       delete hQtCent[icent]; hQtCent[icent]=NULL;
                        continue;
                }
                hQtCent[icent]->SetTitle("Tracklet Charge");