diff --git a/pandora/document/fulltext.py b/pandora/document/fulltext.py
index b383e8df..5ecdab05 100644
--- a/pandora/document/fulltext.py
+++ b/pandora/document/fulltext.py
@@ -63,7 +63,7 @@ class FulltextMixin:
 
     @classmethod
     def find_fulltext_ids(cls, query):
-        if query[0] == '"' and query[-1] == '"':
+        if query and query[0] == '"' and query[-1] == '"':
             query = {
                 "match_phrase": {
                     "text": query.lower()[1:-1]