Fix to prevent segmentation violation in case of no fit result

returned from fitter.  This should never happen (famous last words)
but apparently does.  Please port to the release ASAP.

diff --git a/FMD/AliFMDQAChecker.cxx b/FMD/AliFMDQAChecker.cxx
index 32af8147b926d6dad0f39f052f48a7149d92026d..7c8f3b5ba05d6179bb60378feb8ee83bb7539a90 100644 (file)
--- a/FMD/AliFMDQAChecker.cxx
+++ b/FMD/AliFMDQAChecker.cxx
@@ -464,6 +464,9 @@ AliFMDQAChecker::CheckFit(TH1* hist, const TFitResultPtr& res,
 {
   color = kGreen+4;
 
+  // Check if there's indeed a result - if not, flag as OK
+  if (!res.Get()) return 0;
+
   UShort_t   ret   = 0;
   Int_t      nPar  = res->NPar();
   Double_t   dy    = .06;
@@ -670,10 +673,9 @@ AliFMDQAChecker::CheckRaw(AliRecoParam::EventSpecie_t specie,
 
     // Set our fit function 
     TString fitOpt("QS");
-    TFitResultPtr res  = hist->Fit(func, fitOpt, "", low, high);
-
-    Int_t    color = func->GetLineColor();
-    UShort_t qual  = CheckFit(hist, res, low, high, color);
+    TFitResultPtr res   = hist->Fit(func, fitOpt, "", low, high);
+    Int_t         color = func->GetLineColor();
+    UShort_t      qual  = CheckFit(hist, res, low, high, color);
 
     // Make sure we save the function in the full range of the histogram
     func = hist->GetFunction("landauGaus");