diff --git a/themis/importexport/sync.py b/themis/importexport/sync.py
index 9f7ba97..cd82963 100644
--- a/themis/importexport/sync.py
+++ b/themis/importexport/sync.py
@@ -315,8 +315,14 @@ class SyncFromThemis(UtilityView):
                     object.seance_vote_date = None
                 if data.get('vote_seance') == u'Adoption':
                     object.adopted = True
-                    object.adoption_date = DateTime(data.get('date_approbation_tutelle'))
-                    object.moniteur_date = DateTime(data.get('date_publication_moniteur_belge'))
+                    if data.get('date_approbation_tutelle'):
+                        object.adoption_date = DateTime(data.get('date_approbation_tutelle'))
+                    else:
+                        object.adoption_date = None
+                    if data.get('date_publication_moniteur_belge'):
+                        object.moniteur_date = DateTime(data.get('date_publication_moniteur_belge'))
+                    else:
+                        object.moniteur_date = None
                 else:
                     object.adopted = False
                     object.adoption_date = None