diff --git a/conference/search_indexes.py b/conference/search_indexes.py
index f0845069..eacd306b 100644
--- a/conference/search_indexes.py
+++ b/conference/search_indexes.py
@@ -27,7 +27,7 @@ class ConferenceIndex(indexes.SearchIndex, indexes.Indexable, ExpoSearchMixin):
     members_choice = indexes.IntegerField()
     visitors_choice = indexes.IntegerField()
     price_choice = indexes.IntegerField()
-    price_choice_eur = indexes.IntegerField(model_attr='price_choice_eur')
+    price_choice_eur = indexes.IntegerField(model_attr='price_choice_eur', null=True)
     expohit = indexes.BooleanField(model_attr='expohit')
     rating = indexes.MultiValueField()
 
diff --git a/exposition/search_indexes.py b/exposition/search_indexes.py
index 2db15ce5..b7dc7d8d 100644
--- a/exposition/search_indexes.py
+++ b/exposition/search_indexes.py
@@ -28,7 +28,7 @@ class ExpositionIndex(indexes.SearchIndex, indexes.Indexable, ExpoSearchMixin):
     members_choice = indexes.IntegerField()
     visitors_choice = indexes.IntegerField()
     price_choice = indexes.IntegerField()
-    price_choice_eur = indexes.IntegerField(model_attr='price_choice_eur')
+    price_choice_eur = indexes.IntegerField(model_attr='price_choice_eur', null=True)
     expohit = indexes.BooleanField(model_attr='expohit')
     rating = indexes.MultiValueField()