From f80e1da4b61ad33391af6e24bf5eb94dbabd82e4 Mon Sep 17 00:00:00 2001
From: dibari <dibari@f7af4fe6-9843-0410-8265-dc069ae4e863>
Date: Wed, 18 Apr 2007 13:24:53 +0000
Subject: [PATCH] Protection in Physical node

---
 HMPID/AliHMPIDParam.cxx | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/HMPID/AliHMPIDParam.cxx b/HMPID/AliHMPIDParam.cxx
index 4e4eacdeb87..5ae43cbbb16 100644
--- a/HMPID/AliHMPIDParam.cxx
+++ b/HMPID/AliHMPIDParam.cxx
@@ -45,7 +45,11 @@ AliHMPIDParam::AliHMPIDParam():TNamed("HmpidParam","default version")
         IdealPosition(i,fM[i]);
       } else {
         TGeoPhysicalNode *pnode = pne->GetPhysicalNode();
-        fM[i]=pnode->GetMatrix();
+        if(pnode) fM[i]=pnode->GetMatrix();
+        else {
+          fM[i]=new TGeoHMatrix;
+          IdealPosition(i,fM[i]);
+        }
       }
     } else{
       fM[i]=new TGeoHMatrix;
-- 
2.31.1