--- a/mercurial/HGRepository.st	Thu Mar 07 10:29:56 2013 +0000
+++ b/mercurial/HGRepository.st	Fri Mar 08 20:04:25 2013 +0000
@@ -519,7 +519,8 @@
 changesetWithId: idobj
     | id xid cs |
 
-    id := idobj asHGChangesetId.    
+    id := idobj asHGChangesetId.
+    id = HGChangesetId null ifTrue:[ ^ HGChangeset null].
     "/Try to translate it...
     id hasRevnoOnly ifTrue:[
         xid := revno2nodeIdMap at: id revno ifAbsent:[nil].
@@ -552,7 +553,7 @@
     ^cs .
 
     "Created: / 13-11-2012 / 17:52:10 / Jan Vrany <jan.vrany@fit.cvut.cz>"
-    "Modified: / 22-01-2013 / 22:31:50 / Jan Vrany <jan.vrany@fit.cvut.cz>"
+    "Modified (format): / 08-03-2013 / 19:54:34 / Jan Vrany <jan.vrany@fit.cvut.cz>"
 ! !
 
 !HGRepository::Changesets methodsFor:'initialization'!