diff --git a/apps/search_indexes/filters.py b/apps/search_indexes/filters.py
index ec67fe7a..8040e4b4 100644
--- a/apps/search_indexes/filters.py
+++ b/apps/search_indexes/filters.py
@@ -150,7 +150,7 @@ class CustomFacetedSearchFilterBackend(FacetedSearchFilterBackend):
     def merge_buckets(buckets: list, presrve_ids: list):
         """Reduces all buckets preserving class"""
         result_bucket = buckets[0]
-        result_bucket.tag.buckets = list(filter(lambda x: x in presrve_ids[0], result_bucket.tag.buckets._l_))
+        result_bucket.tag.buckets = list(filter(lambda x: x['key'] in presrve_ids[0], result_bucket.tag.buckets._l_))
         for bucket, ids in list(zip(buckets, presrve_ids))[1:]:
             for tag in bucket.tag.buckets._l_:
                 if tag['key'] in ids: