Canvas: fix possible crash with destroyed canvasses

diff --git a/simgear/props/PropertyBasedMgr.cxx b/simgear/props/PropertyBasedMgr.cxx
index 78d6beb510fe7f44853d44a90d182d835de093a8..5b1c1326e51bbcb1725b03055b9257f3f6b80e1f 100644 (file)
--- a/simgear/props/PropertyBasedMgr.cxx
+++ b/simgear/props/PropertyBasedMgr.cxx
@@ -76,7 +76,7 @@ namespace simgear
       return PropertyBasedElementPtr();
 
     BOOST_FOREACH(PropertyBasedElementPtr el, _elements)
-      if( el->getProps()->getStringValue("name") == name )
+      if( el && el->getProps()->getStringValue("name") == name )
         return el;
 
     return PropertyBasedElementPtr();