message: Fix FPE exception
diff: */
  #include <cstring>
  +#include <iostream>
  #include <TH1D.h>
  #include <TH2D.h>
  @@ -472,6 +473,17 @@ void AliEMCALTriggerOnlineQAPbPb::ComputeBackground()
  {
  AliDebug(2, Form("Entering AliEMCALTriggerQA::ComputeBackground"));
  + if (fPatchAreas[fBkgPatchType] == 0) {
  + if (fNBkgPatchesEMCal[0] > 0 || fNBkgPatchesEMCal[1] > 0 || fNBkgPatchesEMCal[2] > 0 ) {
  + AliErrorStream() << "Area of background patch not set, was expecting no background patches, but instead found non-zero number of patches!" << std::endl;
  + }
  + for (Int_t itype = 0; itype < 3; itype++) {
  + fBkgEMCal[itype] = 0;
  + fBkgDCal[itype] = 0;
  + }
  + return;
  + }
  +
  for (Int_t itype = 0; itype < 3; itype++) {
  if (!IsPatchTypeEnabled(itype, EMCALTrigger::kTMEMCalBkg)) continue;
  