diff --git a/app/models/ticket/search.rb b/app/models/ticket/search.rb
index aa1bea338..b6d91e64a 100644
--- a/app/models/ticket/search.rb
+++ b/app/models/ticket/search.rb
@@ -99,7 +99,7 @@ returns
     end
 
     # try search index backend
-    if !condition && SearchIndexBackend.enabled?
+    if condition.blank? && SearchIndexBackend.enabled?
       query_extention = {}
       query_extention['bool'] = {}
       query_extention['bool']['must'] = []