From bbc15444a89241e987dc23362f0cf3bc84f5cdc7 Mon Sep 17 00:00:00 2001
From: hristov <hristov@f7af4fe6-9843-0410-8265-dc069ae4e863>
Date: Wed, 18 Apr 2007 09:45:33 +0000
Subject: [PATCH] Do not replace the tree if it exists and is empty

---
 STEER/TTreeStream.cxx | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/STEER/TTreeStream.cxx b/STEER/TTreeStream.cxx
index 445f1fb5825..2287454cc2d 100644
--- a/STEER/TTreeStream.cxx
+++ b/STEER/TTreeStream.cxx
@@ -400,8 +400,8 @@ void TTreeStream::BuildTree(){
   //
   // Build the Tree
   //
-  if (fTree->GetEntries()>0) return;
-  fTree = new TTree(GetName(),GetName());
+  if (fTree && fTree->GetEntries()>0) return;
+  if (!fTree)  fTree = new TTree(GetName(),GetName());
   Int_t entries = fElements->GetEntriesFast();  
   fBranches = new TObjArray(entries);
   
-- 
2.43.5