# 
# patch "git_export.cc"
#  from [ba80868e7776cb3467531483a437264616f3d304]
#    to [50da7e2572a5cbcf613dd82c96a65f2f083fe6f9]
# 
========================================================================
--- git_export.cc	ba80868e7776cb3467531483a437264616f3d304
+++ git_export.cc	50da7e2572a5cbcf613dd82c96a65f2f083fe6f9
@@ -483,6 +483,7 @@
         continue;
       seen.insert(rid);
 
+      L(F("descendant search: Considering %s") % rid.inner());
       revision_set rev;
       app.db.get_revision(rid, rev);
 
@@ -495,6 +496,7 @@
           cert_value cv;
           decode_base64(c->inner().value, cv);
           git_object_id gitoid = cv();
+	  L(F("... git ID %s") % gitoid());
 
 	  if (gitrevs.find(cv()) != gitrevs.end())
 	    continue;
@@ -504,7 +506,8 @@
       for (edge_map::const_iterator e = rev.edges.begin();
            e != rev.edges.end(); ++e)
         {
-          frontier.push(edge_old_revision(e));
+	  if (!null_id(edge_old_revision(e)))
+	    frontier.push(edge_old_revision(e));
         }
     }
 }