diff --git a/elasticmock/fake_elasticsearch.py b/elasticmock/fake_elasticsearch.py
index 5118979..0c6c413 100644
--- a/elasticmock/fake_elasticsearch.py
+++ b/elasticmock/fake_elasticsearch.py
@@ -185,7 +185,7 @@ def search(self, index=None, doc_type=None, body=None, params=None):
         result['hits']['hits'] = hits
 
         # build aggregations
-        if 'aggs' in body:
+        if body is not None and 'aggs' in body:
             aggregations = {}
 
             for aggregation, definition in body['aggs'].items():